🎯 Significant Figures Calculator
Count and round significant figures
How Significant Figures Are Counted
- 1Enter any number.
- 2All non-zero digits are counted as significant.
- 3Zeros between non-zero digits are significant.
- 4Leading zeros are not significant; trailing zeros after a decimal point are significant.
- 5The tool displays the count and can round the number to your desired number of sig figs.
About Significant Figures Calculator
Count significant figures in any number and round to a specific number of sig figs. Essential for chemistry, physics, and lab work where precision matters.
Frequently Asked Questions
Are trailing zeros significant?
It depends on context. Trailing zeros after a decimal point are significant (e.g., 2.50 has 3 sig figs). Trailing zeros in a whole number without a decimal point are ambiguous (e.g., 1500 could have 2, 3, or 4 sig figs).
Why are significant figures important?
Significant figures indicate the precision of a measurement. Using more sig figs than your instrument can measure implies false accuracy. Proper sig fig usage ensures honest reporting of data.
How do sig figs work in calculations?
For multiplication and division, the result should have the same number of sig figs as the input with the fewest sig figs. For addition and subtraction, the result should match the least precise decimal place.