Calculators that show the working.
A calculator gives you the answer. These also show how to get there, in words, so the next one is easier to do yourself.
Percentage calculator
Four percentage questions, each answered with the working written out so you can see where the number comes from.
OpenFraction calculator
Add, subtract, multiply, divide and simplify fractions and mixed numbers. Every step is written out.
OpenDiscount and tip calculator
Two everyday percentage sums: what you pay after a discount, and what a tip adds to a bill. Both show how the answer is reached.
OpenRatio simplifier
Type a ratio such as 12:18 or 1.5:2:4 and see it reduced to its simplest form, with each step shown.
OpenAverage calculator
Type or paste a list of numbers. You get all four measures, with the sum, the ordered list and the working for each.
OpenWhat makes these different
Each calculator writes out its steps in plain words, using your numbers. Results are exact: 0.1 + 0.2 comes out as 0.3, long numbers keep all their digits, and anything that had to be rounded is marked with ≈. If an input cannot be used, such as a division by zero or a fraction with 0 on the bottom, the calculator says why instead of showing an error code.
Nothing you type is sent anywhere. The calculations run in your browser.