Professional Calculator
Standard + scientific functions. Keyboard support, history display, and instant results.
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How to use
- Click buttons or use your keyboard (numbers, operators, Enter, Backspace, Escape).
- Scientific functions: √ (square root), x² (square), % (percentage), 1/x (reciprocal).
- Use +/- to toggle sign, CE to clear last entry, C to reset everything.
- Expression shows your current input; result updates automatically.
- Copy result or clear expression with the buttons below.
100% client‑side – no data is sent to any server.