Math

Evaluate scientific expressions with reproducible calculation steps and validation receipts.

Enter a fraction expression such as 2 3/4 ÷ 2/3. Get the exact reduced answer, mixed number, decimal, visual model, step-by-step explanation and a reproducible verification.

Calculate a logarithm in any valid base, or solve the same equation for the argument or base. See the working, verify the result and explore it on a graph.

One calculator for every common percentage question: percent of a number, percentage change, increase and decrease, percentage difference, reverse percentages, points versus percent, discounts, compound changes and conversions — each answer with its formula, working and interpretation.

Solve ax² + bx + c = 0 from coefficients or by typing the whole equation. You get the discriminant, exact roots in simplified radical or complex form, decimals to your chosen precision, every solving step, the vertex and parabola properties, equivalent forms, a graph and an independently verified calculation receipt.

Enter any number — a plain decimal, E notation, 6.022 × 10²³ or a non-normalized form like 53 × 10⁵ — and get the scientific, standard, E and engineering forms at once, with the exponent explained.

Count the significant figures in any number, round to any number of sig figs, or run a whole calculation and see which input limited the answer.

Calculate a confidence interval for a mean, a proportion, a difference between two groups, a paired difference, a standard deviation, a correlation or an event rate — with the recommended method chosen for you, the formula substituted with your own numbers, every step shown and the critical value independently verified.

Calculate the sample or population standard deviation of a data set — together with the variance, mean, range and standard error — with every step shown, every observation’s contribution tabulated, and the result verified by a second, independent algorithm.

Calculate the area of a shape, room, irregular polygon, property or 3D solid. Choose what you are measuring, enter the dimensions in any supported units, and see the formula, substitution, conversions and verification.

Convert metric, US customary, Imperial and scientific units, see the conversion formula, and verify the definition behind every result.