Basic Calculator
Everyday arithmetic, kept simple.
Result appears here.
Supports + − × /, parentheses and decimals. The expression is parsed safely in your browser — nothing is sent anywhere.
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A worked example
01 / EXAMPLEINPUT → OUTPUTEXAMPLE
(12 + 8) * 3 / 4 => 15
The parentheses run first (20), then multiplication (60), then division by 4 gives 15.
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How to use the calculator
02 / STEPS- 01Enter an expression — Type a math line such as (12 + 8) * 3 / 4, or build it with the buttons.
- 02Read the result — The answer updates live beneath the expression as you type or tap.
- 03Copy or clear — Use COPY to grab the result, C to clear, and ⌫ to remove the last character.
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What it handles
03 / DETAILS- ›Four operations — Addition, subtraction, multiplication and division in one expression.
- ›Parentheses — Group parts of a sum to control the order, exactly as in written math.
- ›Decimals — Decimal numbers are supported, so the calculator is not limited to whole numbers.
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Troubleshooting
04 / GUIDEIf evaluation fails, check for a missing closing parenthesis or a dangling operator at the end. Division by zero shows as ∞. The parser follows standard precedence, so 2 + 3 * 4 is 14, not 20 — use parentheses to force a different order.