Significant Figures Calculator
Count significant figures or round numbers based on significant digits. Enter any number including scientific notation (e.g., 3.1415e5).
Understanding Significant Figures
Rules for Significant Figures
- • All non-zero digits are significant (1234 has 4 significant figures)
- • Zeros between non-zero digits are significant (1002 has 4 significant figures)
- • Leading zeros are not significant (0.00123 has 3 significant figures)
- • Trailing zeros after a decimal point are significant (123.400 has 6 significant figures)