Online Calculator with History
A standard calculator with full keyboard support, calculation history, and memory functions. No download needed.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Online Calculator work?
The calculator parses your expression into tokens (numbers and operators), applies standard operator precedence (multiplication and division before addition and subtraction), and evaluates left to right within each precedence level. Memory functions store values in a JavaScript variable that persists for the session, and calculation history is saved to localStorage.
Can I use my keyboard instead of clicking buttons?
Yes. Type numbers and operators directly on your keyboard. Press Enter or = for the result, Escape to clear, and Backspace to delete the last digit.
Is my calculation history saved?
Yes. Your calculations are stored in your browser's local storage and persist between visits. You can clear the history at any time from the history panel.
What are the memory functions (M+, M-, MR, MC)?
M+ adds the current value to memory, M- subtracts it, MR recalls the stored value, and MC clears memory. These let you store intermediate results during complex calculations.