Significant Figures Calculator
Round numbers to the correct number of significant figures. Shows which digits are significant with rules explained.
Significant Figures Calculator
Result
Significant Figures
4
Digit Analysis
0
.
0
0
4
5
2
0
SignificantNot Significant
| Digit | Significant? | Rule |
|---|---|---|
| 0 | No | Leading zeros are not significant |
| 0 | No | Leading zeros are not significant |
| 0 | No | Leading zeros are not significant |
| 4 | Yes | All non-zero digits are significant |
| 5 | Yes | All non-zero digits are significant |
| 2 | Yes | All non-zero digits are significant |
| 0 | Yes | Trailing zeros after decimal point are significant |
Round to Significant Figures
=0.00452
Significant Figures Rules
Rule 1: All non-zero digits are significant.e.g., 123 has 3 sig figs
Rule 2: Captive zeros (zeros between non-zero digits) are significant.e.g., 1002 has 4 sig figs
Rule 3: Leading zeros are NOT significant.e.g., 0.0045 has 2 sig figs
Rule 4: Trailing zeros after a decimal point ARE significant.e.g., 2.300 has 4 sig figs
Rule 5: Trailing zeros in a whole number without a decimal point are ambiguous.e.g., 1500 could have 2 or 4 sig figs