Maker & Reference
Significant Figures Calculator
Sig figs rules: non-zero digits always significant. Zeros between digits count. Trailing zeros after decimal count. Leading zeros never count.
Result (correct sig figs)
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- A sig figs
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- B sig figs
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- Result sig figs
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FAQ
Why sig figs matter? +
Result cannot be more precise than your least-precise input. 12.5 × 3 = 38 (2 sig figs), not 37.5.
Different rule for +/- vs ×/÷? +
Yes. Addition/subtraction: match decimal places. Multiplication/division: match sig fig count. Different physics.