How does the Significant Figures work?

Counting sig figs: ignore leading zeros, count everything else Then: Trailing zeros with decimal point are significant: 3.00 has 3 sig figs Then: Trailing zeros without decimal are ambiguous: 300 could be 1, 2, or 3 sig figs Then: Addition/subtraction: round to the least number of DECIMAL PLACES.

Can you give an example of how to use the Significant Figures?

Example: Input 0.00340 gives a result of 3 significant figures (Leading zeros not significant; trailing zero after decimal IS).

Is the Significant Figures free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Significant Figures?

Our Significant Figures uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Significant Figures

Significant Figures Calculator

Number

Round to (sig figs)

Significant figures (sig figs) indicate the precision of a measurement. They include all certain digits plus one estimated digit. Leading zeros are never significant; trailing zeros after a decimal point are significant. The rules determine how many digits to keep after arithmetic operations.

Rule	Example	Sig Figs
All non-zero digits are significant	1,234	4
Zeros between non-zeros are significant	1,004	4
Leading zeros are NOT significant	0.00789	3
Trailing zeros with decimal ARE significant	12.00	4
Trailing zeros without decimal — ambiguous	1,200	2, 3, or 4

References

›NIST Guide to SI Units — Significant Figures
›Khan Academy — Significant Figures

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