Calculator

A percentage on its own is divided by 100, so 25% is 0.25. After + or −, it is taken of the number before it: 200 + 15% is 230 and 200 − 10% is 180. After × or ÷, it works as a fraction: 3450 × 18% is 621.

Brackets first, then powers, then multiplication and division, then addition and subtraction, just like on a scientific calculator. So 2 + 3 × 4 is 14, and (2 + 3) × 4 is 20.

Yes. Type into the field at the top using the keyboard; the result updates as you type, and Enter replaces the calculation with its result.