How to use the calculator
- Tap the keys or type with your keyboard.
- Use parentheses, %, powers and functions like sin or log when you need them.
- Press = or Enter to see the result.
From quick sums to science
Use it as a basic calculator for shopping, bills and splitting costs, or switch to functions like square roots, powers, trigonometry and logarithms for homework and engineering.
Entering expressions
You can type a whole expression such as (12.5 + 7) × 3 ÷ 4 and see the result update as you type. Parentheses are closed automatically, and the last result can be used in the next calculation.
Avoiding common mistakes
Check the degree or radian setting before using sin, cos or tan. Remember that −3² is −9 because the power applies before the minus sign; write (−3)² for 9.
Frequently asked questions
How does the percent key work?
50% is read as 0.5, so 50% × 200 = 100. To add 15% to 80, type 80 × 1.15.
Does it follow the order of operations?
Yes. Parentheses come first, then powers, then multiplication and division, then addition and subtraction.
Can I use my keyboard?
Yes. Type numbers and operators, use * and / for multiply and divide, and press Enter for the result.
Is it free?
Yes, with no sign-up and no limits. It runs in your browser.