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Calculate an acceptance rate from applicants and admits, analyze a complete admission funnel, or compare your academic profile with officially published college ranges—without false precision.

Enter a date of birth for an exact calendar age in years, months and days — then reuse the same page for age on any date, birth year, age difference and chronological age for testing.

Calculate your term or cumulative GPA, plan the GPA you need to reach a target, and model how retaking a course could change the result. Every calculation shows the formula, the numbers substituted into it, course-level impact, and the assumptions used.

Model a whole course with the Course planner or grade a single score, a weighted course, a points-based course, or find the score you need on the final — one tool, five modes (Course planner, Single score, Weighted course, Points-based course, Final grade target), with letter grades on a scale you can customize.

Work out the hours between two times, with the break taken off — then turn the same entry into a weekly timecard, duration arithmetic, hours from now, or decimal hours, without leaving the page.

Shoe size conversions are recommendations, not exact unit conversions: a size number is a marking convention, so US, UK, EU and Asian sizes only relate to each other through the foot the shoe is built for. This converter goes size to foot length to size, and shows the range and the source behind every answer.

Compare two or more product offers on a common per-unit basis, verify a retailer's shelf-tag unit price against the arithmetic, or measure shrinkflation between an old and new pack size.

Work out how many tiles and how many boxes a job actually needs — for a floor, a wall, a shower, a backsplash or a whole multi-surface project — with the cut loss, the reserve and the box overage reported as three separate numbers instead of one vague word.