How to use this calculator
- Click the buttons or type with your keyboard.
- Press = or Enter to see the result. Esc clears and Backspace deletes the last character.
- Keep calculating from the result by pressing an operator, or click a previous calculation in the history to edit it.
Formula
The calculator follows the standard order of operations: parentheses, then multiplication and division from left to right, then addition and subtraction from left to right. Many cheap pocket calculators evaluate strictly left to right instead, which can give different answers.
2 + 3 × 4 = 14 (not 20)
(2 + 3) × 4 = 20
Frequently asked questions
Why does 0.1 + 0.2 give exactly 0.3?
Many software calculators use binary floating point, which gives 0.30000000000000004. This calculator uses decimal arithmetic, so results match what you'd get by hand.
Do I need the scientific calculator?
Use the scientific calculator for powers, roots, trigonometry, logarithms, factorials and memory functions.
Can I use the keyboard?
Yes. Type numbers and + − * / ( ) directly, and press Enter to calculate.