Brown Sugar Calculator
Convert brown sugar between cups, grams and ounces, work out the white sugar and molasses that make a given amount, and compare substitutes — with the packing convention behind every number shown.
Convert brown sugar
Which published weight?
Make brown sugar
I need an amount, a unit and a type of brown sugar
Which molasses ratio?
Substitute for brown sugar
Swap brown and white sugar
Result
Result
1 packed US cup of light brown sugar ≈ 220 g
Depends on packing Measured packed. Light and dark brown sugar weigh the same, so the type changes the flavour, not this number.
Equivalent measurements
- Grams
- ≈ 220 g
- Ounces
- ≈ 7.76 oz
- Pounds
- ≈ 0.485 lb
- US cups
- 1 cup
- Tablespoons
- 16 tbsp
- Teaspoons
- 48 tsp
Measured, not fixed Uses 220 g per cup, packed — U.S. Department of Agriculture, Agricultural Research Service, FoodData Central, SR Legacy — "Sugars, brown" (FDC ID 168833, NDB 19334). Brown sugar has no fixed weight per cup: the same sugar measured a different way gives a different answer.
- Brown sugar has no fixed weight per cup. This result uses the packed measurement published by usda-fdc-168833; measuring the sugar a different way changes the answer.
1 US cup is about 220 grams.
Brown Sugar Conversion Chart
Both tables are generated by the calculator above, one row at a time. They are not a copy of it and they cannot fall out of step with it — change the reference weight in the tool and these numbers change with it.
| Brown sugar | Grams (packed) | Grams (unpacked) | Ounces (packed) | Tablespoons |
|---|---|---|---|---|
| 1/4 cups | 55 g | 36.3 g | 1.94 oz | 4 tbsp |
| 1/3 cups | 73.3 g | 48.3 g | 2.59 oz | 5.33 tbsp |
| 1/2 cups | 110 g | 72.5 g | 3.88 oz | 8 tbsp |
| 2/3 cups | 147 g | 96.7 g | 5.17 oz | 10.7 tbsp |
| 3/4 cups | 165 g | 109 g | 5.82 oz | 12 tbsp |
| 1 cup | 220 g | 145 g | 7.76 oz | 16 tbsp |
| 1 1/2 cups | 330 g | 218 g | 11.6 oz | 24 tbsp |
| 2 cups | 440 g | 290 g | 15.5 oz | 32 tbsp |
Going the other way, from a weight on the scale back to cups:
| Brown sugar | Cups (packed) | Cups (unpacked) | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g | 0.114 cups | 0.172 cups | 1.82 tbsp | 0.882 oz |
| 50 g | 0.227 cups | 0.345 cups | 3.64 tbsp | 1.76 oz |
| 75 g | 0.341 cups | 0.517 cups | 5.45 tbsp | 2.65 oz |
| 100 g | 0.455 cups | 0.69 cups | 7.27 tbsp | 3.53 oz |
| 125 g | 0.568 cups | 0.862 cups | 9.09 tbsp | 4.41 oz |
| 150 g | 0.682 cups | 1.03 cups | 10.9 tbsp | 5.29 oz |
| 200 g | 0.909 cups | 1.38 cups | 14.5 tbsp | 7.05 oz |
| 250 g | 1.14 cups | 1.72 cups | 18.2 tbsp | 8.82 oz |
| 500 g | 2.27 cups | 3.45 cups | 36.4 tbsp | 17.6 oz |
The packed and unpacked columns are the same sugar. Which one applies depends entirely on how it went into the cup, which is why both are here rather than one figure presented as the answer.
How Much Does a Cup of Brown Sugar Weigh?
A packed US cup of brown sugar weighs 220 g (7.76 oz). The same cup, spooned in without pressing, weighs 145 g.
Both figures are household measures published by USDA FoodData Central for a single food entry, “Sugars, brown”. The packed cup is about 52% heavier than the unpacked one — not a different product, just a different amount of pressing.
US recipes that call for “1 cup brown sugar” mean the packed cup, so 220 g is the figure most people want. If a recipe says “lightly spooned”, or if you scooped without pressing, the unpacked figure is the honest one.
A second published measurement exists: King Arthur Baking weighs its own packed cup at 213 g, about 3.3% below USDA's. Both are in the calculator's source picker. Neither is averaged into the other, because the average is a number nobody measured.
Make Brown Sugar Calculator
You can make brown sugar from white granulated sugar and molasses, and the calculator's Make mode works backwards from the amount you actually want to end up with.
For one packed cup of light brown sugar — 220 g finished — that is 205 g of white granulated sugar and 14.5 g of molasses, roughly 2.1 teaspoons. For dark, the same cup takes 21.1 g of molasses and 199 g of sugar.
There is no need to cream the two together first: the cited source notes both can go into the recipe at the same time.
How Much Molasses Do You Need?
Per 100 g of finished brown sugar: 6.6 g of molasses for light and 9.59 g for dark, with the balance made up of white granulated sugar. Those work out to molasses fractions of 6.6% and 9.59% by weight.
Manufactured brown sugar is less molasses-rich than that: about 3.5% for light and 6.5% for dark. The home recipe is written for flavour in a bake, not to match a refinery specification, and the calculator keeps the two as separate options rather than blending them into one figure.
Why “add 10% molasses” and “10% molasses in the result” are different amounts
This is the arithmetic most brown-sugar instructions get loose about, and it is why this calculator is final-weight based. Take a round 10% purely to make the numbers obvious — it is an illustration, not a brown-sugar figure:
- Adding 10% on top. Start with 100 g of white sugar, stir in 10 g of molasses. You now have 110 g of brown sugar — 10 g more than you asked for — and the molasses is only 9.09% of it, not 10%.
- Ending up with 100 g at 10%. Use 90 g of white sugar and 10 g of molasses. That gives you exactly 100 g, and the molasses really is 10% of it.
If your recipe calls for a weight of brown sugar, the second one is what you want. The calculator always splits the weight you asked for, so the two parts add back to exactly that weight — for 100 g of dark brown sugar, 90.4 g of sugar plus 9.59 g of molasses, and nothing left over.
Brown Sugar Substitute Calculator
Each substitute below is offered at the ratio, and on the basis, its source actually establishes. Where a source published a weight relation and no volume one, the calculator answers by weight and declines to guess a cup measure.
| Substitute | Quantity basis | Similarity | Moisture | Flavour change | Best use / caveat |
|---|---|---|---|---|---|
| White granulated sugar + molasses | By weight only | Closest match | Same | Same | None expected. The cited source notes there is no need to mix the molasses into the sugar first — both can go into the recipe at the same time. |
| White granulated sugar alone | Cup for cup | Recipe-dependent | Less | Different | The cited source is explicit that this swap "will produce unpredictable results; sometimes the swap works just fine, sometimes not so well". It is likeliest to work where the recipe is leavened with baking powder and brown sugar is only a small part of the total sugar. |
| Muscovado sugar | By weight or by volume | Very close | More | Different | The cited source states the relation in the direction "brown sugar substitutes for muscovado". This calculator applies it in reverse, which is the same interchange, but the source’s own wording is recorded here rather than paraphrased into a claim it did not make. |
| Coconut sugar | By weight only | Good | Less | Different | Weigh it. From the same publisher’s chart, coconut sugar is 154 g per cup against brown sugar’s 213 g, so a cup-for-cup swap would be about 28% short on sugar by mass. |
Deliberately not offered, and why:
- Honey — No cited source publishes a ratio. Swapping a liquid sweetener for a granulated one also changes the recipe’s total liquid, its browning and its oven temperature, so a bare ratio would be misleading even if one existed.
- Maple syrup — Same as honey: the cited baking authority gives no ratio for liquid sweeteners in place of brown sugar.
- Turbinado / demerara sugar — The cited source classes these as finishing sugars for garnishing and states they do not dissolve as easily in batters, so they are not offered as a brown-sugar replacement.
- Date sugar — The cited source names date sugar only as a substitute FOR coconut sugar, never for brown sugar. Chaining one published relation onto another would be inventing a third.
Can You Substitute Brown Sugar for White Sugar?
Quantity replacement may be possible, but the ingredients are not functionally identical in baking.
Cup for cup is the usual quantity basis. What changes is everything else: brown sugar brings molasses, and molasses brings moisture, acidity and colour that plain white sugar does not have.
Expect a softer, moister, chewier result with a darker crumb and a caramel note the original recipe did not have. In a recipe leavened with baking soda you are also adding acid for the soda to react with, which can change the rise and the browning; where the recipe uses baking powder alone the effect is smaller.
Note too that cup for cup is not gram for gram. A packed cup of brown sugar is 220 g against 200 g for a cup of granulated, so if you bake by weight you have to decide which of the two you are matching — you cannot match both.
Going this direction is generally the safer of the two, but it is still a substitution rather than an equivalence.
Can You Substitute White Sugar for Brown Sugar?
Quantity replacement may be possible, but the ingredients are not functionally identical in baking — and this is the riskier direction of the two.
King Arthur Baking is explicit that the swap “will produce unpredictable results; sometimes the swap works just fine, sometimes not so well.”
You are removing the molasses, and with it the moisture that makes a brown-sugar bake soft and chewy, and the acidity that a baking-soda recipe may be relying on. Expect a crisper, drier result, more spread in cookies, a paler colour and a flatter sweetness.
It is likeliest to work where the recipe is leavened with baking powder rather than soda, and where brown sugar is only a small part of the total sugar. If you have molasses in the cupboard, the better answer is not to substitute at all: use the Make mode above and rebuild the brown sugar from white sugar and molasses, which reproduces what you removed.
Light vs. Dark Brown Sugar
Molasses content. Light brown sugar is about 3.5% molasses by weight; dark is about 6.5%. That is the entire difference between them as manufactured products.
Weight. They weigh the same. USDA holds one “Sugars, brown” entry with no light/dark split, and King Arthur's chart covers “dark or light, packed” in a single row. This is why the calculator's brown-sugar type control changes the Make and Substitute answers but never the conversion — there is no separate weight to change.
Flavour and moisture. Dark carries the more assertive flavour and a little more of the moisture molasses brings. Light is the default where a recipe just says “brown sugar”.
Interchangeability. One for one, by weight or by volume, with no adjustment. The cited source states the small difference in acidity between them does not significantly affect leavening, and that the difference in appearance and taste “won't be obvious in your baked goods”.
In practice. Use dark where you want the molasses to be part of the flavour — gingerbread, sticky toffee, barbecue sauce, dark cookies. Use light where the sugar is a background sweetener. If a recipe names one and you have the other, use what you have.
How to Measure Brown Sugar
Packed, by volume. Spoon brown sugar into a dry measuring cup and press it down firmly with the back of the spoon, adding more as it compacts, until the cup is full and level. Tipped out, it should hold the shape of the cup. That is what a recipe means by “packed”, and it is the measurement the 220 g figure describes.
By weight, which is better. 220 g is 220 g on any day, in any cup, pressed by anyone. A packed cup is a technique, and techniques vary between people and between attempts by the same person. The gap between a firmly packed and a barely packed cup in the published data is about 52% — enough to change a bake, and entirely invisible while you are doing it. If you own scales, weigh it and the question disappears.
Small amounts. A tablespoon and a teaspoon are exact fractions of the cup — 16 tablespoons and 48 teaspoons to a cup — so a packed tablespoon of brown sugar is 13.8 g and a packed teaspoon is 4.58 g. Pack spoons the same way you would pack a cup.
Hardened sugar. Break lumps up before measuring. A lump traps air around it, so a cup of lumpy brown sugar is lighter than a cup of the same sugar broken up, and packing will not fully correct it.
Why Brown Sugar Conversions Differ
Why does one cup of brown sugar weigh differently on different websites?
Because they are not all measuring the same thing, and none of them is measuring a constant.
- Brown sugar is compressible. It is damp, it clumps, and it collapses under pressure. Almost nothing else in a recipe behaves this way — a cup of water is a cup of water. A cup of brown sugar is however much you managed to fit in.
- Packed and loose are different measurements. USDA measured both: 220 g packed, 145 g unpacked. A site publishing one figure without saying which is describing a technique it did not disclose.
- The convention is the number. “Grams per cup” for brown sugar is not a measurement of the sugar; it is a measurement of the sugar and a stated way of putting it in the cup. Drop the second half and the number means nothing in particular.
- Moisture and granule size vary. Brands differ, and an open bag dries out over weeks. Two genuinely careful measurements of two different bags will not agree exactly.
- Rounding compounds. A source publishing 220 g and one publishing 213 g are about 3.3% apart before anyone rounds a quarter-cup answer. Round each row and the tables drift further.
- A kitchen reference weight is not a physical density. Density is a property of a substance; this is a property of a substance plus a protocol. Publishing it as though it were a constant of nature — as a tidy g/mL that converts anything to anything — is the category error underneath most of the disagreement. This calculator has no density value in it at all.
So the practical answer is not “find the right number”. It is: use the convention your recipe assumed, or sidestep the whole question by weighing.
Calculation Methodology
Conversion, formulation and substitution are not the same thing
Most brown-sugar tools collapse these into one box, which is why their answers can be quietly wrong. This calculator keeps them apart because they are different operations with different evidence behind them.
- Conversion asks how much is this. One packed cup is 220 g. The sugar does not change; only the unit does. Within one dimension it is exact by definition — 16 tablespoons to a cup, always. Across volume and weight it needs a measurement convention and a source.
- Formulation asks what is this made of. 220 g of light brown sugar is 205 g of white sugar plus 14.5 g of molasses. Now two ingredients are involved and a published ratio decides the split.
- Substitution asks what else could I use. Coconut sugar replaces brown sugar by weight only, and the answer is not only a quantity — it is a quantity plus what changes in the bake. A substitution reported as a bare number has left out most of the answer.
A tool that answers a substitution question with a conversion, or a formulation question by adding molasses on top of a weight rather than inside it, gives a number that looks right and is not.
1. Exact unit conversions
Cups, tablespoons, teaspoons, millilitres, grams, kilograms, ounces and pounds are not defined by this calculator. Their factors come from CalcDomain's shared unit registry, which holds them at their exact international values: the US cup and its subdivisions from NIST Handbook 44, the gram and millilitre from the SI Brochure, and the pound and ounce from the 1959 international yard and pound agreement.
Within one dimension the arithmetic is exact and the page says so without an approximation marker: 16 tablespoons and 48 teaspoons to a US cup, 16 ounces to a pound. These are exact integers in the calculator's floating-point arithmetic, not rounded results, and the test suite asserts them as exact equalities rather than as tolerances.
2. Kitchen reference measurements
Crossing from volume to weight is a different kind of operation. It cannot be done from unit definitions alone, because it depends on the ingredient. The calculator uses published household measures — someone weighed a cup of the stuff and printed the number — and every such answer carries the name of whoever weighed it.
Three are offered for brown sugar: 220 g and 145 g per cup from USDA FoodData Central, and 213 g per packed cup from King Arthur Baking. Companion ingredients used by the Make and swap models — granulated sugar, molasses, coconut sugar — carry their own published measures on the same terms.
3. The packed convention, and why it is not a density
A brown sugar cup-to-gram conversion is convention-dependent. It is not a universal density. Density is a property of a substance: water is 1 g/mL wherever you measure it. What this page uses is a property of a substance and a protocol — how firmly the sugar was pressed into the cup. Change the protocol and the number moves by more than half again, from 145 g to 220 g for the same sugar out of the same bag.
The data model has no g/mL field anywhere, and no code path multiplies a volume by a density. Every volume-to-weight figure is attached to a named packing state, and only the two states a cited source actually measured are offered — packed and unpacked. There is no interpolated "lightly packed" coefficient in this vertical, because nobody published a measurement of one.
Packed is the default because the cited baking authority publishes brown sugar only in its packed form and US recipes assume it. That is a convention about how recipes are written, recorded as such, and switchable.
4. Light and dark formulation
Two published bases are kept, never merged. The manufactured composition — about 3.5% molasses by weight for light and 6.5% for dark — answers what brown sugar is. The tested home recipe answers what to stir in, and its fraction is derived inside that one source from that source's own gram weights, so no figure is borrowed across publishers.
Both are applied to the FINAL weight: molasses = final × M, white sugar = final − molasses, so the two parts add back to exactly the weight you asked for. Neither basis gets a separate reference weight for light and dark, because both cited authorities state the two varieties weigh the same.
5. Substitution methodology
A substitution ratio is applied only on the basis its source establishes. Where a source published a weight relation and no volume one — coconut sugar is the case here — the calculator answers by weight and refuses a cup measure rather than converting through a cup weight nobody published. A ratio the source stated is labelled as quoted; a ratio inferred from the source's own recipe is labelled as derived.
Every substitution answer carries its moisture, flavour and acidity consequences alongside the quantity, and each of those claims declares whether a source said it or the calculator reasoned it from composition. An inference is never allowed to carry a citation. Substitutes for which no cited source publishes a ratio — honey, maple syrup and the other liquid sweeteners — are listed as excluded with the reason, rather than quietly left out.
6. Approximation and rounding policy
Internal arithmetic is never rounded. Rounding happens once, at display, and is capped at 3 significant figures — the precision the published reference weights actually carry. A figure like 220 g is published to three digits, so quoting an answer derived from it to six would be inventing precision the source never had.
Answers that depend on a measurement convention are marked with ≈ and labelled convention-dependent; answers that are exact by definition are not marked, because marking them would imply a doubt that does not exist. A kitchen volume rounded to a practical fraction is always marked approximate.
Every constant this calculator uses
The complete inventory, with what each number is for, whether it is exact or measured, which packing convention it belongs to, how it is rounded and who published it. The build fails if any constant the calculator computes with has no traceable source, and fails if this table omits one the engine uses.
Unit definitions — exact, fixed by standards bodies
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| teaspoons | 0.00000492892159375 | cubic metres per unit | exact-by-definition | — | US teaspoon — the smallest kitchen volume this calculator accepts | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | NIST Office of Weights and Measures |
| tablespoons | 0.0000147867647813 | cubic metres per unit | exact-by-definition | — | US tablespoon — one sixteenth of the US cup, exactly | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | NIST Office of Weights and Measures |
| US cups | 0.0002365882365 | cubic metres per unit | exact-by-definition | — | US customary cup — the unit US recipes mean by "cup" | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | NIST Office of Weights and Measures |
| millilitres | 0.000001 | cubic metres per unit | exact-by-definition | — | Millilitre — the metric volume unit, for recipes written in mL | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | BIPM (International Bureau of Weights and Measures) |
| grams | 0.001 | kilograms per unit | exact-by-definition | — | Gram — the working unit for every weight this calculator reports | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | BIPM (International Bureau of Weights and Measures) |
| kilograms | 1 | kilograms per unit | exact-by-definition | — | Kilogram — SI base unit of mass, for bulk quantities | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | BIPM (International Bureau of Weights and Measures) |
| ounces | 0.028349523125 | kilograms per unit | exact-by-definition | — | Ounce (avoirdupois) — a mass, not the fluid ounce | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | United States — Federal Register |
| pounds | 0.45359237 | kilograms per unit | exact-by-definition | — | Pound (avoirdupois) — for recipes and packaging written in pounds | Never rounded. The factor is applied at full double precision and the result is rounded only for display. | United States — Federal Register |
| tablespoons per US cup | 16 | dimensionless ratio | exact-by-definition | — | Lets the page state "1 US cup = N tablespoons" without an approximation marker | None. This ratio is an exact integer in IEEE-754 arithmetic and is asserted as an exact equality by the test suite. | NIST Office of Weights and Measures |
| teaspoons per US cup | 48 | dimensionless ratio | exact-by-definition | — | Lets the page state "1 US cup = N teaspoons" without an approximation marker | None. This ratio is an exact integer in IEEE-754 arithmetic and is asserted as an exact equality by the test suite. | NIST Office of Weights and Measures |
| teaspoons per tablespoon | 3 | dimensionless ratio | exact-by-definition | — | Lets the page state "1 tablespoon = N teaspoons" without an approximation marker | None. This ratio is an exact integer in IEEE-754 arithmetic and is asserted as an exact equality by the test suite. | NIST Office of Weights and Measures |
| ounces per pound | 16 | dimensionless ratio | exact-by-definition | — | Lets the page state "1 pound = N ounces" without an approximation marker | None. This ratio is an exact integer in IEEE-754 arithmetic and is asserted as an exact equality by the test suite. | United States — Federal Register |
| grams per kilogram | 1000 | dimensionless ratio | exact-by-definition | — | Lets the page state "1 kilogram = N grams" without an approximation marker | None. This ratio is an exact integer in IEEE-754 arithmetic and is asserted as an exact equality by the test suite. | BIPM (International Bureau of Weights and Measures) |
Brown sugar reference masses — measured, convention-dependent
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| Brown sugar, 1 cup, packed | 220 | grams | measured | packed | Bridges volume and mass for brown sugar. This is the only way the two dimensions connect in this vertical. | Published to 3 significant figures; every answer derived from it is capped at that precision for display. | U.S. Department of Agriculture, Agricultural Research Service |
| Brown sugar, 1 cup, unpacked | 145 | grams | measured | unpacked | Bridges volume and mass for brown sugar. This is the only way the two dimensions connect in this vertical. | Published to 3 significant figures; every answer derived from it is capped at that precision for display. | U.S. Department of Agriculture, Agricultural Research Service |
| Brown sugar, 1 cup, packed | 213 | grams | measured | packed | Bridges volume and mass for brown sugar. This is the only way the two dimensions connect in this vertical. | Published to 3 significant figures; every answer derived from it is capped at that precision for display. | King Arthur Baking Company |
Companion ingredients — measured
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| granulated sugar, 1 cup | 200 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 3 significant figures. | U.S. Department of Agriculture, Agricultural Research Service |
| granulated sugar, 1 tsp | 4.2 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 2 significant figures. | U.S. Department of Agriculture, Agricultural Research Service |
| granulated sugar, 1 cup | 198 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 3 significant figures. | King Arthur Baking Company |
| molasses, 1 tbsp | 20 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 2 significant figures. | U.S. Department of Agriculture, Agricultural Research Service |
| molasses, 1 cup | 337 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 3 significant figures. | U.S. Department of Agriculture, Agricultural Research Service |
| molasses, 0.25 cup | 85 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 2 significant figures. | King Arthur Baking Company |
| coconut sugar, 0.5 cup | 77 | grams | measured | — | Used by the Make and Brown ↔ White models, which involve ingredients other than brown sugar. | Published to 2 significant figures. | King Arthur Baking Company |
Published cross-checks — used to verify, never to compute
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| USDA’s own packed teaspoon agrees with its packed cup | 4.6 | grams | measured | — | Verification only. This figure is never used to produce an answer; it is used to check the figure that is. | Compared against the anchor within 1% relative tolerance. | U.S. Department of Agriculture, Agricultural Research Service |
| USDA’s own unpacked teaspoon agrees with its unpacked cup | 3 | grams | measured | — | Verification only. This figure is never used to produce an answer; it is used to check the figure that is. | Compared against the anchor within 1% relative tolerance. | U.S. Department of Agriculture, Agricultural Research Service |
| USDA’s molasses cup and tablespoon do NOT agree with each other | 337 | grams | measured | — | Verification only. This figure is never used to produce an answer; it is used to check the figure that is. | Compared against the anchor within 1% relative tolerance. | U.S. Department of Agriculture, Agricultural Research Service |
Formulation ratios
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| Molasses mass fraction — light brown sugar, commercial composition | 0.035 | mass fraction (0-1) | approximate | — | Splits a target weight of brown sugar into white sugar and molasses. M is applied to the FINAL weight, never added on top of it. | Displayed to 2 significant figures. The source states it as "hovers around 3.5%". | King Arthur Baking Company |
| Molasses mass fraction — dark brown sugar, commercial composition | 0.065 | mass fraction (0-1) | approximate | — | Splits a target weight of brown sugar into white sugar and molasses. M is applied to the FINAL weight, never added on top of it. | Displayed to 2 significant figures. The source states it as "about 6.5%". | King Arthur Baking Company |
| Molasses mass fraction — light brown sugar, kitchen recipe | 0.0660377358491 | mass fraction (0-1) | approximate | — | Splits a target weight of brown sugar into white sugar and molasses. M is applied to the FINAL weight, never added on top of it. | Displayed to 2 significant figures. The source states it as "1 cup (198 g) white granulated sugar + 2 teaspoons (14 g) molasses". | King Arthur Baking Company |
| Molasses mass fraction — dark brown sugar, kitchen recipe | 0.0958904109589 | mass fraction (0-1) | approximate | — | Splits a target weight of brown sugar into white sugar and molasses. M is applied to the FINAL weight, never added on top of it. | Displayed to 2 significant figures. The source states it as "1 cup (198 g) white granulated sugar + 1 tablespoon (21 g) molasses". | King Arthur Baking Company |
| light recipe component — white sugar | 198 | grams | measured | — | One term of the published recipe the molasses fraction is derived from. | As published by the source; not rounded further. | King Arthur Baking Company |
| light recipe component — molasses | 14 | grams | measured | — | One term of the published recipe the molasses fraction is derived from. | As published by the source; not rounded further. | King Arthur Baking Company |
| dark recipe component — white sugar | 198 | grams | measured | — | One term of the published recipe the molasses fraction is derived from. | As published by the source; not rounded further. | King Arthur Baking Company |
| dark recipe component — molasses | 21 | grams | measured | — | One term of the published recipe the molasses fraction is derived from. | As published by the source; not rounded further. | King Arthur Baking Company |
Substitution ratios
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| White granulated sugar + molasses — replacement ratio | 1 | multiplier, applied by mass | stated-by-source | — | Converts an amount of brown sugar into an amount of the substitute, on the basis the source establishes. | The ratio itself is exact; the quantity it is applied to carries whatever precision its own conversion had. | King Arthur Baking Company |
| White granulated sugar alone — replacement ratio | 1 | multiplier, applied by volume | derived | — | Converts an amount of brown sugar into an amount of the substitute, on the basis the source establishes. | The ratio itself is exact; the quantity it is applied to carries whatever precision its own conversion had. | King Arthur Baking Company |
| Muscovado sugar — replacement ratio | 1 | multiplier, applied by either | stated-by-source | — | Converts an amount of brown sugar into an amount of the substitute, on the basis the source establishes. | The ratio itself is exact; the quantity it is applied to carries whatever precision its own conversion had. | King Arthur Baking Company |
| Coconut sugar — replacement ratio | 1 | multiplier, applied by mass | stated-by-source | — | Converts an amount of brown sugar into an amount of the substitute, on the basis the source establishes. | The ratio itself is exact; the quantity it is applied to carries whatever precision its own conversion had. | King Arthur Baking Company |
| Brown sugar → white granulated sugar — quantity basis | 1 | multiplier, applied by volume | derived | — | The quantity side of a brown/white swap. It is deliberately reported alongside caveats, never as an equivalence. | Exact as a ratio. The mass consequence shown next to it carries the reference weights’ precision. | King Arthur Baking Company |
| White granulated sugar → brown sugar — quantity basis | 1 | multiplier, applied by volume | derived | — | The quantity side of a brown/white swap. It is deliberately reported alongside caveats, never as an equivalence. | Exact as a ratio. The mass consequence shown next to it carries the reference weights’ precision. | King Arthur Baking Company |
Engineering choices — no source, and none claimed
| Constant | Value | Unit | Exactness | Convention | Purpose | Rounding | Source |
|---|---|---|---|---|---|---|---|
| Maximum accepted amount | 1000000000 | the input’s own unit | n/a — an engineering choice, not a measurement | — | Upper bound on what the parser accepts, so a huge input is refused with a clear message rather than becoming Infinity. | Not a displayed value. | Engineering choice — no source claimed |
| Maximum amount-input length | 64 | characters | n/a — an engineering choice, not a measurement | — | Refuses an absurdly long input before parsing it. | Not a displayed value. | Engineering choice — no source claimed |
| Display precision | 3 | significant figures | n/a — an engineering choice, not a measurement | — | Caps every displayed number, so an answer never claims more precision than the reference weight behind it. | This IS the rounding policy. Applied once, at display, never during calculation. | Engineering choice — no source claimed |
| Kitchen fraction denominator | 8 | parts per unit | n/a — an engineering choice, not a measurement | — | The practical fraction a volume is rounded to when shown as a kitchen measure. | Always marked as approximate when the rounding is not exact. | Engineering choice — no source claimed |
Authorship and review
Written by: Ugo Candido — Founder & Editor-in-Chief · Editorial review: Ugo Candido, Founder & Editor-in-Chief () · Last updated: · Engine: brown-sugar-engine v1.0.0
What "reviewed" means here No independent external review by a food scientist or professional baker has been carried out. Saying otherwise would be a claim this page cannot support.
Technical verification: Dedicated brown-sugar engine, data, share-state, renderer and content test suites on every build. Reference vectors are pinned directly to the cited documents (USDA FoodData Central household measures; King Arthur Baking ingredient weights and tested ratios), and each source is cross-checked against its own other published measures — which is how the 5.3% disagreement between USDA molasses cup and tablespoon figures was found and disclosed rather than averaged away. Coverage includes exact unit vectors, round-trip conversion across the full unit matrix, mass conservation in the formulation model, unit equivalence, finiteness, determinism, and a constants gate that fails the build if any number the calculator computes with lacks a traceable source.
These are automated regression tests written by the same author, not an outside expert's sign-off. They can prove the page is arithmetically consistent with its cited sources; they cannot prove the sources are the best available, which is a judgement the author is responsible for.
One engine behind everything on this page
The calculator, both conversion charts, the substitute table and every figure in the prose above are produced by the same computation. There is no second set of numbers anywhere on this page and no hand-typed table, so nothing here can drift out of step with the tool.
Unit definitions come from CalcDomain's shared unit registry with their exact international values, so the volume ladder is exact: 16 tablespoons and 48 teaspoons to a US cup, no rounding involved. Crossing between volume and weight is treated as a different kind of operation, because it is — that is the step that needs a named packing convention and a named source, and the calculator labels every such answer as convention-dependent rather than exact.
Internal arithmetic is never rounded; rounding is applied once, at display, and capped at three significant figures, which is all the published reference weights support. A figure like 220 g is published to three digits, so an answer quoted to six would be inventing precision the source never had.
Full methodology, assumptions and limitations are recorded in this page's definition and held in place by automated tests covering the reference vectors from each cited document, round-trip conversion, mass conservation, unit equivalence and determinism.
Frequently Asked Questions
How many grams is a cup of brown sugar?
One packed US cup is 220 g and one unpacked cup is 145 g, both household measures published by USDA FoodData Central for 'Sugars, brown'. That 75 g gap is the same sugar measured two ways, which is why this calculator asks how you measured rather than printing a single figure. King Arthur Baking measures its own packed cup at 213 g; both are offered here and neither is averaged with the other.
Should brown sugar be packed or not?
Packed, unless a recipe says otherwise. US recipes that call for '1 cup brown sugar' mean the sugar pressed firmly into the cup so it holds the cup's shape when turned out, and King Arthur Baking publishes brown sugar only in its packed form. If a recipe explicitly says 'lightly spooned' or gives a weight, follow that instead — and if it gives a weight, use the weight, because it removes the ambiguity entirely.
Do light and dark brown sugar weigh the same?
Yes. USDA holds a single 'Sugars, brown' entry with no light/dark split, and King Arthur states the two weigh the same and are interchangeable one for one whether you are baking by weight or by volume. They differ in molasses content — light around 3.5%, dark around 6.5% by weight — which changes colour and flavour rather than mass.
How much molasses do I add to make brown sugar?
For light brown sugar, two teaspoons of molasses per cup of white granulated sugar; for dark, one tablespoon per cup. Those are the tested quantities King Arthur Baking publishes. This calculator works backwards from the finished weight you want, so the molasses comes out of that total rather than being added on top of it: ask for 220 g of light brown sugar and you get about 205 g of white sugar plus 15 g of molasses, which add back to exactly 220 g.
Why does a home-made brown sugar have more molasses than the shop-bought kind?
Because the two numbers answer different questions. Manufactured light brown sugar is about 3.5% molasses by weight; the home recipe works out at about 6.6%. The recipe is written for flavour in a bake, not to match a refinery specification. This calculator stores both and lets you pick, rather than blending them into one figure that neither source published.
Can I use white sugar instead of brown sugar?
Cup for cup, sometimes — but King Arthur Baking is explicit that it 'will produce unpredictable results; sometimes the swap works just fine, sometimes not so well'. You lose the molasses moisture, so expect a drier, crisper result with more spread, and you lose the molasses acidity, which matters in a recipe leavened with baking soda. It is likeliest to work where the recipe uses baking powder and brown sugar is only a small part of the total sugar.
Is a cup-for-cup swap between brown and white sugar the same by weight?
No, and this trips people up. A packed cup of brown sugar is 220 g while a cup of granulated is 200 g, both from USDA. So swapping cup for cup changes the sugar mass by about 10%. If you are baking by weight, decide which one you are matching — the volume or the mass — because you cannot match both.
What can I use instead of brown sugar?
The closest is the thing brown sugar is made of: white granulated sugar plus molasses, which reproduces the moisture, the acidity and the flavour. Muscovado works one for one by volume or weight and brings a stronger burnt-caramel note and more moisture. Coconut sugar works one for one by weight only — it is 154 g per cup against brown sugar's 213 g on the same chart, so a cup-for-cup swap would be about 28% short. This calculator does not offer honey or maple syrup, because no cited source publishes a ratio for them.
How do I measure brown sugar without scales?
Press it firmly into a dry measuring cup with the back of a spoon until it holds the cup's shape when tipped out, and level the top. That is what 'packed' means. Scales are better — they remove the packing question entirely — but a packed cup measured consistently is close enough for most baking, and this calculator will convert it either way.
How many tablespoons are in a cup of brown sugar?
Sixteen, exactly, because the US tablespoon is defined as one sixteenth of the US cup and the teaspoon as one forty-eighth. That part of the answer is exact by definition and needs no assumption about packing. It is only when you convert to grams that the packing state starts to matter.
How many grams is half a cup of brown sugar?
110 g packed, or 72.5 g unpacked. Half a cup is exactly half the full-cup figure, because the volume-to-weight step is a single multiplication — the packing convention is what decides the answer, not the size of the measure.
How many grams is 3/4 cup of brown sugar?
165 g packed, or 108.75 g unpacked. If your recipe gives a weight and you are measuring by volume, the packed figure is the one it almost certainly means, because US recipes assume brown sugar is packed unless they say otherwise.
How many ounces is a cup of brown sugar?
About 7.76 oz packed. That is the avoirdupois ounce, a unit of mass — not the fluid ounce, which measures volume. A US cup is 8 fluid ounces of space no matter what you put in it, so the two numbers being close here is a coincidence of brown sugar's weight, not a rule.
What can I use if I have no molasses?
If you have brown sugar, you do not need molasses at all — the molasses is only for making brown sugar from scratch. If you have neither, muscovado is the closest single-ingredient stand-in and works one for one by weight or by volume, and coconut sugar works one for one by weight. Plain white sugar will work in some recipes and not others; the cited source calls that swap unpredictable.
What is the difference between muscovado and brown sugar?
Muscovado is unrefined: the molasses was never removed, rather than being added back after refining. It is wetter, stickier and stronger tasting, with what the cited source calls a pronounced burnt caramel-like flavour and a deep brown colour. It substitutes for brown sugar one for one by volume or by weight, but break up the clumps first or it will pack unevenly.
Should I measure brown sugar by weight or by volume?
By weight, if you own scales. A packed cup is a technique rather than a fixed quantity, and the published gap between a packed and an unpacked cup of the same sugar is over 50%. Weighing removes the packing question entirely and gives the same result every time, in any cup, for anyone.
Why do brown sugar conversions differ between websites?
Because brown sugar is compressible and there is no single correct grams-per-cup figure to find. USDA publishes 220 g packed and 145 g unpacked for the same sugar; King Arthur Baking measures its own packed cup at 213 g. Add differences in moisture, granule size and brand, plus rounding on every row of a table, and the published figures spread out. A grams-per-cup number is a measurement plus a stated technique, not a physical constant.
Can I use dark brown sugar instead of light?
Yes, one for one, by weight or by volume, with no other adjustment. The cited source states the two are interchangeable and that the small difference in acidity between them does not significantly affect leavening. The bake will be a little darker and the molasses flavour more assertive, which is usually welcome in gingerbread or a dark cookie and less so where the sugar is meant to stay in the background.
Sources
Every number on this page traces to one of these documents. Where two of them disagree — USDA measures a packed cup at 220 g, King Arthur Baking at 213 g — both are offered in the calculator and neither is averaged into a figure nobody published.
- King Arthur Baking Company — Ingredient Weight Chart. Cup weights measured to King Arthur’s own scooping protocol: brown sugar (dark or light, packed) 1 cup = 213 g; granulated sugar 1 cup = 198 g; molasses 1/4 cup = 85 g; coconut sugar 1/2 cup = 77 g; confectioners’ sugar (unsifted) 1 cup = 113 g. Muscovado is not listed. Checked 2026-08-27.
- King Arthur Baking Company — Light vs. dark brown sugar: What’s the difference? (2025-01-22). Commercial composition by weight: light brown sugar molasses content "hovers around 3.5%", dark "about 6.5%". States that light and dark weigh the same and are interchangeable 1:1 "whether you’re baking by weight or volume", and that the "small difference in acidity" between them does not significantly affect leavening. Checked 2026-08-27.
- King Arthur Baking Company — What can I substitute for brown sugar? (2020-03-04). Kitchen formulation, with the publisher’s own gram weights: light brown sugar = 1 cup (198 g) white granulated sugar + 2 teaspoons (14 g) molasses; dark brown sugar = 1 cup (198 g) white granulated sugar + 1 tablespoon (21 g) molasses. On replacing brown sugar with plain white sugar: "using white granulated sugar in place of brown sugar will produce unpredictable results; sometimes the swap works just fine, sometimes not so well." Checked 2026-08-27.
- King Arthur Baking Company — A guide to different types of sugars, how to use them, and when to substitute (2023-03-21). Substitution relationships: muscovado ↔ brown sugar "by volume or weight"; coconut sugar ↔ brown sugar, muscovado, date sugar "(all by weight)". Turbinado and demerara are described as finishing sugars and are not offered as granulated-sugar substitutes. No ratio is published for honey, maple syrup or any other liquid sweetener. Checked 2026-08-27.
- NIST Office of Weights and Measures — Handbook 44, Appendix C — General Tables of Units of Measurement. The authoritative US tables for customary units: the US liquid gallon of 231 cubic inches and its subdivisions — quart, pint, cup, fluid ounce, tablespoon and teaspoon. This is where the US cup of 236.5882365 mL, and the exact 16-tablespoon and 48-teaspoon subdivisions of it, come from. Checked 2026-08-27.
- BIPM (International Bureau of Weights and Measures) — The International System of Units (SI Brochure), 9th edition. Defines the SI base and derived units and the SI prefixes. This vertical takes the kilogram, the gram and the millilitre (via the litre, exactly 0.001 m³) from it. Checked 2026-08-27.
- United States — Federal Register — Refinement of Values for the Yard and the Pound (1959 international yard and pound agreement), 24 FR 5348. Fixes the avoirdupois pound at exactly 0.45359237 kilogram, from which the avoirdupois ounce of exactly 28.349523125 g follows as one sixteenth. These are the two mass units this calculator converts to and from. Checked 2026-08-27.
- U.S. Department of Agriculture, Agricultural Research Service — FoodData Central, SR Legacy — "Molasses" (FDC ID 168820, NDB 19304). Household measures for molasses: 1 tbsp = 20 g; 1 cup = 337 g. Checked 2026-08-27.
- U.S. Department of Agriculture, Agricultural Research Service — FoodData Central, SR Legacy — "Sugars, brown" (FDC ID 168833, NDB 19334). Household measures for brown sugar: 1 cup packed = 220 g; 1 cup unpacked = 145 g; 1 tsp packed = 4.6 g; 1 tsp unpacked = 3 g; 1 tsp brownulated = 3.2 g. The entry is a single "Sugars, brown" food — USDA does not split light from dark. Checked 2026-08-27.
- U.S. Department of Agriculture, Agricultural Research Service — FoodData Central, SR Legacy — "Sugars, granulated" (FDC ID 169655, NDB 19335). Household measures for granulated white sugar: 1 cup = 200 g; 1 tsp = 4.2 g. Checked 2026-08-27.
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Engine: brown-sugar-engine v1.0.0. Written by Ugo Candido, last updated August 27, 2026.