Calculator
A calculator for everyday sums and for school or work maths. Tap the keys or type, and see the answer as you go.
Use the Calculator
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How to use the Calculator
- Type an expression or tap the keys. The answer appears as you type.
- Press Enter or = to keep the result and add it to your history.
- Switch to Scientific for functions, powers and angles in degrees or radians.
- Tap a history item to use it again.
About this tool
Calculations use a safe expression reader instead of running code. It follows normal order of operations, supports brackets, the % sign (which divides by 100), factorials, and multiplication written as 2π or 3(4+1). Results are shown to 12 significant digits.
Good to know: Computers store decimals approximately, so tiny rounding differences are hidden by showing 12 digits. Factorials are limited to whole numbers up to 170. The % key divides by 100 and does not work like the percent button on some handheld calculators.
Free to use. Your inputs are processed in your browser and are not sent to our servers. Results are for general information; see the disclaimer.
Frequently asked questions
How do I calculate a percentage?
Type 15% of 200 as 200*15%, which gives 30. The % sign divides the number before it by 100.
What is the difference between degrees and radians?
They are two ways to measure angles. A full circle is 360 degrees or about 6.283 radians. Choose degrees for everyday angle problems.
Can I use the keyboard?
Yes. Type numbers and operators, press Enter to calculate and Escape to clear.