Significant Figures Calculator
Confused by trailing zeros? Enter any number to instantly identify which digits are significant. You can even round the number to your exact requirements.
Last updated: March 3, 2026
Decimal Point Trick
If you want to explicitly declare that the zeros at the end of a whole number are significant, just place a decimal at the end! Example: 1000. instead of 1000.
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The Rules of Significant Digits
Counting sig figs doesn't have to be confusing. Just remember these three categories for zeros.
Leading Zeros
Zeros at the very beginning of a number are never significant. They just exist to locate the decimal point.
Example: 0.0025 (2 sig figs)
Captive Zeros
Zeros trapped between two non-zero digits are always significant. They are measured numbers.
Example: 308 (3 sig figs)
Trailing Zeros
Zeros at the end are significant only if the number contains a decimal point.
Example: 10.0 (3 sig figs)
vs 100 (1 sig fig)
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