Online Calculator
Fast and convenient online calculator. Keyboard shortcuts are supported.
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The Digital Calculator That Is Always With You
No need to reach for your phone or a desk calculator. This online calculator lets you quickly perform basic operations — addition, subtraction, multiplication, division and percentage calculations. Works with both mouse and keyboard. Supports decimal notation and shows a live calculation history on screen.
How to Use
Basic Operations
- AC — clears all and starts from zero
- +/− — toggles the sign of the displayed number (positive ↔ negative)
- % — converts the number to a percentage (e.g. 25 → 0.25); used mid-operation it calculates a proportional amount
- ÷ × − + — four basic arithmetic operators
- = — calculates the result and updates the display
Keyboard Shortcuts
| Key | Function |
|---|---|
| 0–9 | Digit input |
| , or . | Decimal separator |
| + − * / | Operator keys |
| Enter or = | Calculate result |
| Escape | Clear (AC) |
| Backspace | Delete last character |
| % | Percentage |
How Does Percentage Work?
Standalone percentage: press 50 % → 0.5
Mid-operation percentage: 200 + 15 % → adds 15% of 200 (30) = 230
This behaviour matches the percentage logic on standard iOS/Android calculators.
How to Read the Display
The display shows two lines. The top line shows the running calculation history in small text (e.g. "1,500 ×"). The bottom line shows the active number in large text. Decimal numbers are displayed with a period as the decimal separator (e.g. 1,234.56).
Usage Tips
- If you make a mistake in a long calculation, use Backspace to delete the last digit instead of clearing everything.
- For chained operations, press the next operator directly instead of "=" — the previous result carries over.
- If a division by zero occurs, the display shows Error; press AC to clear.
- A maximum of 12 digits is supported; longer inputs are not accepted.