Significant Figures Calculator

1. Enter a number — Type any number with or without decimal point.
2. Set sig figs — Optionally specify how many significant figures to round to.
3. Calculate — View the count, rounded value, and scientific notation with detailed rule explanations.

Significant figures (sig figs) are the digits in a number that carry meaning contributing to its measurement precision. The rules for counting sig figs are:

• All non-zero digits are always significant.
• Zeros between non-zero digits are always significant.
• Leading zeros (before non-zero digits) are never significant.
• Trailing zeros after a decimal point are significant.
• Trailing zeros in a whole number without a decimal are not significant.