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Calculator
A safe, keyboard-friendly expression calculator.
Type an expression — the result updates as you go. Enter saves it to history.
History(this session only — never persisted)
Saved results appear here.
About this tool
Type a full mathematical expression — with parentheses, percentages and powers — and see the result live as you type. Under the hood a small expression parser evaluates your input safely, so it can never execute anything beyond arithmetic. A session history lets you re-check previous results, and it all works offline.
- Evaluate expressions with correct operator precedence
- Quick unit-free math while reading docs or code
- Check a formula before committing it to a spreadsheet
- Keep a short session history of results