Significant Figures Calculator
Round a number to a given number of significant figures. Shows the result in standard and scientific notation.
Result
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What Are Significant Figures?
Significant figures are the meaningful digits in a number. They indicate the precision of a measurement.
Rules for Counting Significant Figures
- All non-zero digits are significant.
- Zeros between non-zero digits are significant.
- Leading zeros are not significant.
- Trailing zeros after a decimal point are significant.
123456 rounded to 3 sig figs = 123000
0.00456 rounded to 2 sig figs = 0.0046
0.00456 rounded to 2 sig figs = 0.0046
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Last updated: 2026-08-08