Sig Fig Calculator
Count and round significant figures from the typed number, including decimal zeros, exact numbers, and scientific notation.
Significant figures
Enter a number
Lexical parser preserves decimal points, trailing zeros, and exponent notation.
- Scientific notation
- Not calculated
- Rounded value
- Only shown in round mode
| Digit | Counts | Reason |
|---|
significant digits are counted from the first nonzero digit, with decimal trailing zeros preserved
How?
How this is calculated
The tool parses the typed string instead of converting it to a JavaScript number. Nonzero digits count, leading zeros do not, zeros between nonzero digits count, and trailing zeros after a decimal point count. Whole-number trailing zeros without a decimal point are ambiguous, so the selected convention is shown.
Exact-number mode reports unlimited significant figures. Round mode keeps the full typed precision until the final display and uses tie-to-even rounding unless half-up is selected.
Formula: significant digits are counted from the first nonzero digit, with decimal trailing zeros preserved
Sources
- OpenStax Chemistry 2e, Measurement Uncertainty, Accuracy, and Precision. OpenStax. Retrieved .
- OpenStax Chemistry 2e, Mathematical Treatment of Measurement Results. OpenStax. Retrieved .
Method last reviewed