Basic calculator
Use this free online calculator for everyday arithmetic. Press keys on screen or use your keyboard (Enter to evaluate, Esc to clear).
How to use the basic calculator
Enter numbers and operators, then press =. Parentheses let you control order of operations. The percent key treats a number like 25% as 0.25 inside an expression.
This tool is ideal for receipts, homework checks, and quick mental-math verification without installing an app.