Count significant figures in any number and round to a desired precision. Learn the rules for determining significant figures.
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Count significant figures in any number and round to specified precision. Learn the rules for significant figures with detailed breakdowns. Essential for science, engineering, and laboratory work.
Significant figures (sig figs) indicate the precision of a measurement. They include all certain digits plus one uncertain digit. For example, 12.34 has 4 significant figures. Leading zeros are not significant (0.0025 has 2 sig figs), but trailing zeros after a decimal are significant (2.50 has 3 sig figs).
Significant Figures Rules
Non-zero digits + Captive zeros + Trailing zeros after decimalReport measurements with appropriate precision.
Ensure calculations reflect measurement accuracy.
Balance equations and report concentrations correctly.
Express experimental results with proper uncertainty.
No. Leading zeros are placeholders and are not significant. For example, 0.0025 has only 2 significant figures (2 and 5).