Significant Figures Calculator
Solve expressions and round results to any number of significant figures.
Round to significant figures: (optional)
What are Significant Figures?
Significant figures (sig figs) are the meaningful digits in a number — the ones that carry real precision. Understanding them is essential in science, engineering, and any field where measurement accuracy matters.
How to Count Significant Figures
These ARE significant
- • Any non-zero digit (e.g.
7in673) - • Zeros between non-zero digits (e.g.
0in205) - • Trailing zeros after a decimal point (e.g.
90.7500has 6 sig figs)
These are NOT significant
- • Leading zeros (e.g.
007has 1 sig fig) - • Leading zeros after a decimal (e.g.
0.007has 1 sig fig) - • Trailing zeros without a decimal point (e.g.
100has 1 sig fig)
Examples
| Number | Sig Figs | Explanation |
|---|---|---|
| 7 | 1 | Single non-zero digit |
| 100 | 1 | Trailing zeros, no decimal |
| 0.0637 | 3 | Leading zeros are not significant |
| 30.00 | 4 | Trailing zeros after decimal ARE significant |
| 673.52 | 5 | All non-zero digits are significant |
| 0.0025 | 2 | Only 2 and 5 are significant |
Supported Operators
+ - * /
Arithmetic
^
Exponent
( )
Grouping
log( )
Base-10 log
ln( )
Natural log
Frequently Asked Questions
1.5 / log(6)), choose how many significant figures to round to, and click Calculate. The tool evaluates the expression, then rounds the result to your chosen precision while showing the exact value and sig fig count. Check Out Other Popular Tools
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