Mathematics / Science

Significant Figures

Round any number to a specified number of significant figures and see step-by-step reasoning.
Input
Result
Sig Fig Rules
• Non-zero digits are always significant
• Zeros between non-zeros are significant (e.g. 105)
• Leading zeros are NOT significant (e.g. 000.25)
• Trailing zeros after decimal ARE significant (e.g. 2.500)
• Trailing zeros without decimal are ambiguous (use scientific notation)
📐 Accuracy Note: Results are calculated using standard formulas and are provided for educational and reference purposes. While we strive for accuracy, floating-point arithmetic and rounding may introduce small errors. Do not rely on this tool for safety-critical, professional, or high-precision applications without independent verification.