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Simple Calculator

Fast, free online calculator with history & keyboard support

 
0
History
  • No calculations yet
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How to Use the Calculator

  1. Click buttons or type on your keyboard — digits, operators, and Enter all work instantly.
  2. Use AC to clear everything, or Backspace to delete the last digit.
  3. +/− toggles the sign of the current number; % converts it to a decimal percentage.
  4. Press = or Enter to evaluate. The result stays ready for your next operation.
  5. History shows your last calculations — click any entry to restore its result.

Keyboard Shortcuts

0 – 9Digit input
+Add
-Subtract
*Multiply
/Divide
EnterCalculate
BackspaceDelete last digit
EscapeClear all
.Decimal point

Frequently Asked Questions

Does this calculator save my history?

History is kept in memory for your current browser session only. Refreshing the page clears it. We never store your calculations on a server.

Can I use it on mobile?

Yes — the calculator is fully responsive. On mobile, tap the on-screen buttons. The system keyboard is suppressed to keep the experience clean and accurate.

What does the % button do?

It divides the current number by 100. For example, entering 25 and pressing % displays 0.25. Useful for calculating tips, discounts, and tax amounts quickly.

What is the maximum number this calculator handles?

It uses JavaScript's native number type — IEEE 754 double precision — which supports up to 15–17 significant digits. For everyday arithmetic this is more than sufficient.

Can I chain multiple operations?

Yes. You can type a full expression like 12 + 7 × 3 and hit = to evaluate it. The expression is shown in the display so you always see what you're calculating.