Significant Figures Calculator
Identify significant figures and round to the requested precision.
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How to use
- 1Enter a number and the desired number of significant figures.
About
Counting follows the written decimal notation; trailing zeros can depend on measurement context.
Significant figures calculator
Count significant figures and round a number to a chosen precision.
Leading zeros do not count; zeros between digits do. Trailing zeros in an integer without a decimal point are convention-dependent.
Enter the original number and a target from 1 to 15 significant figures.
Significant figures describe measurement precision, not just magnitude.
Practical examples
- 0.00450 has 3 significant figures; rounded to 2 it becomes 0.0045.
Limitations and notes
- Trailing zeros in whole numbers without a decimal marker are ambiguous.
- Use valid values and keep all units consistent.
How to use
- 1Enter a number.
- 2Choose the target precision.
- 3Review the count and rounded form.
Frequently asked questions
Do leading zeros count?
No. They only locate the decimal point.
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