Math Calculators
Seven tools for the arithmetic that shows up in real life: percentages at the shops, averages in a gradebook, ratios in a recipe, conversions in a workshop. Each one shows the working, so you can follow it — and check it — yourself.
- Percentage Calculator — percentages, increases, decreases, change, and percent off.
- Fraction Calculator — add, subtract, multiply, and divide fractions, with the simplified result.
- Average Calculator — mean, median, mode, and range for any set of numbers.
- Ratio Calculator — simplify ratios and split an amount fairly by ratio.
- GPA Calculator — weighted GPA on a 4.0 scale, course by course.
- Unit Converter — length, weight, and temperature, with the factors shown.
- Area Calculator — area of rectangles, circles, triangles, and more, with formulas.
Percentages, fractions, and ratios are the same idea in three outfits — parts of a whole. If one of them feels unfamiliar, try the other two and the pattern usually clicks. The unit converter is the one to reach for before the area calculator, so all your measurements are in one unit before you multiply.
Also worth a look: Finance Calculators · Health Calculators · Everyday Calculators · All Calculators