Significant Figures Calculator
Enter a number or an expression (e.g.,
5.13*3.78)Results
Decimal notation:—
Number of significant figures:—
Number of decimals:—
Scientific notation:—
E notation:—
Step-by-step output
SF = significant figure
References
- All non-zero digits are significant.
- Zeros between non-zero digits are significant.
- Leading zeros before the first non-zero digit are not significant.
- Trailing zeros are significant only when there is a decimal point.
- Rounding uses “half-up” (5 rounds up).
- Add/Subtract → round the final result to the fewest decimal places among inputs.
- Multiply/Divide → round the final result to the fewest significant figures among inputs.