Significant Figures Calculator

Count significant figures, round numbers, and perform sig-fig arithmetic.

Number

Significant Figures: 4

0.004560

Highlighted digits are significant.

Round to N Significant Figures

sig figs

Result: 0.00456

Significant Figures Rules

All non-zero digits are significant.
Zeros between non-zero digits are significant.
Leading zeros are not significant.
Trailing zeros after a decimal point are significant.
Trailing zeros in a whole number without a decimal point are ambiguous (treated as not significant here).

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