Significant Figures Calculator
Count significant figures or solve equations using sig fig rules.
Supports +, -, *, /
Rules for Significant Figures
Significant figures (sig figs) are digits that carry meaningful information about the precision of a measurement.
Counting Rules
- Non-zero digits are always significant. (e.g., 22 has 2)
- Any zeros between two significant digits are significant. (e.g., 202 has 3)
- Trailing zeros in the decimal portion ONLY are significant. (e.g., 0.50 has 2, but 0.5 has 1)
- Leading zeros are NEVER significant. (e.g., 0.004 has 1)
Result Rules
- Multiplication/Division: The result should have the same number of sig figs as the value with the least significant figures used in the calculation.
- Addition/Subtraction: The result should have the same number of decimal places as the value with the least decimal places.