How to use the calculator
- Tap the keys or type on your keyboard. Numbers,
+ - * /,%and parentheses all work. - The answer appears under your calculation as you type. Press = or Enter to keep it, then continue calculating with it.
- Press ⌫ (or Backspace) to delete the last character, and AC (or Esc) to clear everything.
Your calculations are listed under History. Click one to bring its result back. The history is kept only while this page is open.
Order of operations
The calculator follows the standard order of operations: multiplication and division come before addition and subtraction, so 2 + 3 × 4 is 14, not 20. Use parentheses to change the order: (2 + 3) × 4 is 20.
How percentages work
50 × 20%= 10, which is 20% of 50.80 + 15%= 92, which is 80 plus 15% of 80. Handy for tips and sales tax.200 − 25%= 150, which is 200 with a 25% discount.
For other percentage questions, such as the percentage change between two numbers, use the Percentage Calculator.
FAQ
Why does 0.1 + 0.2 show 0.3 here?
Computers store decimals in binary, which causes tiny rounding errors such as 0.30000000000000004. Results here are rounded to 12 significant digits, so you see the answer you expect.
Can I calculate sine, logarithms or powers?
Yes, with the Scientific Calculator. It adds trigonometry, logarithms, powers, roots and factorials.