Significant Figures Calculator (Sig Fig Counter and Rounder)

Your details

Choose whether to count sig figs, round a number, or perform an arithmetic operation with proper sig fig rounding.
Enter any real number. Decimal and scientific notation are both supported.
Significant figures4 significant figures
4

Number of significant figures in the input

Sig figs in A4
Sig figs in A4
Sig figs in B-

12.34 has 4 significant figures.

  • The number 12.34 contains 4 significant figures.
  • Because there is a decimal point, trailing zeros after the decimal are significant.

Next stepSwitch to "Round a number to N sig figs" mode to see how to express this number at a different precision.

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