Significant figures
Significant figures: use first measured number, second measured number (operations only), operation. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
×/÷ use the fewest significant figures; +/− use the least precise decimal place.
Variables & units
- First measured number
- Text input
- Second measured number (operations only)
- Text input
- Operation
- Select an option
- Significant figures (round only)
- Numeric value · minimum 1, maximum 15
Worked example
12.30 has 4 significant figures. 12.30 × 1.2 rounds to 15.
Assumptions
Trailing zeros in an integer without a decimal point are treated as placeholders. Use 1200. or scientific notation to state their significance.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
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