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Basic Calculator

A clean, fast arithmetic calculator for addition, subtraction, multiplication, and division — keyboard friendly and always within reach.

✓ Free✓ No signup✓ Privacy first✓ Runs in your browser
Basic Calculator – ToolPremier
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History

Clean browser-based calculator · keyboard support · history log · percentage and sign toggle

How it works
Convert in three steps

Enter numbers and operators

Click the on-screen buttons or use your keyboard’s number keys and arithmetic operators.

Chain calculations

Continue calculating from the result of the previous operation without re-entering the number.

Get your result

Press = or Enter. Use the percentage key to convert the current value to a percentage, and the +/− key to toggle sign.

FAQ
Common questions

Addition, subtraction, multiplication, division, percentage (converts to decimal for use in further calculation), and sign toggle (positive/negative). The decimal point and grouping separator are formatted for readability.

Yes. The calculator handles numbers up to 15 significant digits — the precision limit of JavaScript’s 64-bit floating-point number format. Very large numbers switch to scientific notation display automatically.

Yes. Number keys, +, −, *, /, Enter, Escape (clear), and Backspace all work. The calculator is fully operable without a mouse.

The % key divides the current input by 100, converting it to a decimal. Useful for calculating percentages in context: enter 50, press +, enter 20, press %, press = → gives 60 (50 + 20% of 50).

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About the Basic Calculator

Sometimes you just need a calculator — no scientific functions, no finance formulas, no interface to navigate. This basic calculator does exactly that: clean, fast arithmetic that works with keyboard input, gives you a scrollable history, and gets out of the way. It’s useful as a persistent browser tab for quick calculations throughout the day, as an alternative when your device’s calculator app isn’t within reach, and for simple operations where a more complex tool would be slower.

Benefits
  • Clean, uncluttered interface — number keys, four operations, percentage, sign toggle.
  • Full keyboard input — operate entirely without the mouse.
  • Calculation history — scroll back through previous results in the session.
  • Works offline — no network required after the page loads.
Privacy

All calculations run in your browser. No data is transmitted to any server.