Significant Figures Calculator
Round a numeric value to a chosen count of significant figures while retaining trailing zeros.
Loading tool…
How to use Significant Figures Calculator
Significant-figure rounding keeps the requested number of digits from the first nonzero digit. The output preserves trailing zeros that convey precision.
- Enter number, significant figures (1–15).
- Check that the input follows the stated limits and uses consistent units.
- Run the calculator, review the result, then copy or download it.
Good to know
- This rounds a value; it does not infer the measurement uncertainty or count significant figures from an original text representation. JavaScript rounding is used, not a configurable decimal tie rule.
- Decimal inputs have at most 120 characters and magnitude from 1e-100 to 1e15, or zero. Floating-point results are rounded to 12 significant digits; extreme derived results may underflow or be rejected. Exact integer results are identified separately.
Common questions
What calculation does Significant Figures Calculator perform?
Significant-figure rounding keeps the requested number of digits from the first nonzero digit. The output preserves trailing zeros that convey precision.
Why might the answer use exponent notation?
Exponent notation makes the retained digit count explicit for very large or small values.
Keep going with related tools
All math →Descriptive Statistics Calculator
Summarize a numeric list with mean, median, modes, range, count, and sum.
MathFraction Calculator
Add, subtract, multiply, or divide two fractions and reduce the exact result.
MathUncorrelated Measurement Uncertainty Budget
Build a transparent first-order uncertainty budget with standard or bounded-distribution components and an entered coverage factor.