🔢 Calculator
A free online calculator for everyday arithmetic and scientific calculations. Switch between Basic and Scientific modes, and every result is saved to your history below — all directly in your browser, nothing sent to a server.
History
How to Use This Calculator
Basic mode covers everyday arithmetic — addition, subtraction, multiplication, and division — for quick totals, bills, and tips. Switch to Scientific mode for trigonometric functions (sin, cos, tan), logarithms (log, ln), square roots, exponents, and constants like π and e.
You can use your keyboard instead of clicking: number keys and +, -, *, / for operators, Enter to calculate, Esc to clear, and Backspace to correct a digit.
Every calculation is added to the History panel above so you can revisit past results. History is stored locally in your browser only — it's never uploaded anywhere.