Basic Calculator
A fast, keyboard-friendly calculator for everyday arithmetic. Handles addition, subtraction, multiplication, division, percentages, and sign changes — with a live expression display so you always see what you're computing.
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Keyboard supported
Keyboard Shortcuts
| 0–9, . | Enter digits and decimal point |
| + − * / | Arithmetic operators |
| Enter | Evaluate (=) |
| Escape / Delete | Clear all (C) |
| Backspace | Delete last digit (⌫) |
Order of Operations
This calculator evaluates left to right (chain mode).
Each operator press commits the previous value.
Example: 5 + 3 × 2 = (5+3) × 2 = 16 (not 5 + 6 = 11)
For standard precedence, use the Scientific Calculator.
How to use
Basic operations
Click the number buttons or type on your keyboard to enter values. Use +, −, ×, ÷ to chain operations. Press = or Enter to evaluate.
Percentage
Press % after a number to convert it to a decimal fraction (e.g. 50% becomes 0.5). Useful for calculating discounts: enter 200, then ×, then 20, then %, then = to get 40.
Sign change (±)
Toggles the current number between positive and negative.
Keyboard shortcuts
All digits, +, -, *, / are mapped directly. Backspace deletes the last digit. Escape or Delete clears everything. Enter evaluates.
Tips
- •Chain multiple operations without pressing = each time — the running total updates automatically.
- •The top line shows the full expression so you can catch mistakes before evaluating.
- •Use the browser's back button to return to the home page without losing your work.