Round any number to a chosen count of significant figures.
Round any number to a chosen count of significant figures.
Enter values above and click Calculate — results will appear here with the formula explained.
Significant figures communicate measurement confidence: reporting 12.34 cm implies precision to hundredths that a ruler reading of 12 cm doesn't possess. Rounding to sig figs trims digits that measurements never actually delivered.
Counting rules trip everyone initially: leading zeros never count (0.00456 has three), captive zeros always do (405 has three), trailing zeros count only after a decimal point (120 has two; 120. has three). Scientific notation sidesteps ambiguity — 1.20 × 10² unambiguously carries three.
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Significant Figures Calculator: Round any number to a chosen count of significant figures. Formula: round to n sig figs: identify leading-digit position, keep n digits, round remainder. Example: 0.
Significant figures communicate measurement confidence: reporting 12.34 cm implies precision to hundredths that a ruler reading of 12 cm doesn't possess. Rounding to sig figs trims digits that measurements never actually delivered.
Counting rules trip everyone initially: leading zeros never count (0.00456 has three), captive zeros always do (405 has three), trailing zeros count only after a decimal point (120 has two; 120. has three). Scientific notation sidesteps ambiguity — 1.20 × 10² unambiguously carries three.
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0.004567 to three sig figs: leading zeros don't count, so keep 4, 5, 6 and round → 0.00457.
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