Significant Figures Calculator & Counter

1. All non-zero digits are significant (e.g., 123 has 3).
2. Zeros between non-zero digits are significant (e.g., 1002 has 4).
3. Leading zeros before non-zero digits are never significant (e.g., 0.005 has 1).
4. Trailing zeros to the right of a decimal point are significant (e.g., 4.500 has 4).
5. Trailing zeros in a whole number without a decimal point are ambiguous (e.g., 1500 has 2 unless written as 1.500 × 10³).

In addition and subtraction, the final result is limited by the measurement with the fewest decimal places (least precise place value), not the total number of significant figures.

In multiplication and division, the final result must retain the same number of significant figures as the factor with the fewest significant figures.

Yes! You can enter numbers using standard decimal notation or scientific E-notation (like 6.022e23 or 1.5e-4).