How to use
- Click the buttons or type with your keyboard.
- Press = or Enter to see the answer. The result also shows as you type.
- Tap "Scientific" for trigonometry, logarithms, powers and roots.
- Your last calculations appear in the history — click one to use it again.
Formula
Percent works like a phone calculator: 200 × 10% = 20, and 500 + 10% = 550 (10% of 500 is added). Multiplication and division are done before addition and subtraction, as in maths.
Tips and common uses
Percent works like a phone
Typing 200 × 10% gives 20, and 500 + 10% gives 550 because 10% of 500 is added. Use the keyboard for speed: numbers, the operator keys, Enter for the answer and Esc to clear.
Use Scientific for school and exam maths
Switch to Scientific for sin, cos, tan, logarithms, powers and square roots. Angles are in degrees by default, which suits most school problems. Tap DEG to switch to radians when a question needs it.
Check your work with the history
The last calculations stay in the history. Click one to bring it back and change a number, which is quicker than typing the whole sum again and helps you spot a slip.
Frequently asked questions
Which keyboard keys can I use?
Numbers, + − * / . % ^ ( ), Enter or = for the answer, Backspace to delete and Esc to clear.
Is this a scientific calculator?
Yes. Tap "Scientific" to get sin, cos, tan, log, ln, powers, square roots, brackets and pi, with degrees or radians. Switch back to Basic for everyday sums.
How do I calculate a percentage here?
Type the number, then ×, then the percentage and %. For example 200 × 10% shows 20. For adding a percentage, 500 + 10% shows 550.
Does it use degrees or radians?
Degrees by default, which is what most school problems use. Tap DEG to switch to RAD.
Why is 0.1 + 0.2 exactly 0.3 here?
Computers store decimals with tiny rounding errors. The calculator rounds the answer to 12 significant digits so you see the correct result.
Is this online calculator free, and does it work on a phone?
Yes. It is free, needs no sign-up or app, and works in the browser on a phone, tablet or computer. The sums are worked out on your own device.
How do I find a square root or a power?
Tap "Scientific". Use the square-root key for roots and the ^ key for powers, for example 2 ^ 10 gives 1024.