Calculator
A simple calculator for basic arithmetic operations.
History
No calculation history
About this tool
A simple online calculator that handles the four basic arithmetic operations — addition, subtraction, multiplication, and division — plus percentage and sign toggle. Calculations are done locally in your browser, so no data is sent to a server. A history panel keeps the last ten results so you can revisit recent computations.
How to use
- Click number buttons or type with your keyboard.
- Choose an operator (+, −, ×, ÷) to chain operations.
- Press = or Enter to see the result.
- Use C to clear everything, CE to clear only the current entry.
- Check the right-side panel for your recent calculation history.
Common use cases
- Quick everyday math like splitting a bill or calculating change.
- Verifying spreadsheet formulas with a manual cross-check.
- Helping kids learn arithmetic with an on-screen calculator.
- Calculating discount percentages while shopping online.
- Doing quick conversions and basic engineering checks.
Frequently asked questions
Q. Are calculations sent to your servers?
A. No. Everything runs in your browser using JavaScript. Nothing leaves your device.
Q. Why does dividing by zero show 0?
A. Division by zero is mathematically undefined. The calculator returns 0 to avoid breaking the display.
Q. Can I use my keyboard?
A. Yes. Number keys, operators, Enter (=), Escape (clear), and Backspace are all supported.
Q. Why are some long decimals slightly off?
A. JavaScript uses IEEE-754 floating point, so values like 0.1 + 0.2 may show tiny rounding artifacts.