Significant Figures Calculator
Count significant figures in any number. Free online sig figs calculator with rules explained.
💡 Enter number → count sig figs. Example: "0.00450" → "3 significant figures".
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Significant Figures Rules
Step-by-step guide with examples
Input
Convert
Result
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Rules
1. All non-zero digits are significant. 2. Zeros between non-zero digits are significant. 3. Leading zeros are NOT significant. 4. Trailing zeros after a decimal point ARE significant. Examples: • 450 → 2 sig figs • 0.00450 → 3 sig figs • 100.0 → 4 sig figs
Frequently Asked Questions
2 common questions answered
2 Questions2 AnswersClick to expand
Q1What are significant figures?
Significant figures are the meaningful digits in a number that contribute to its precision. They include all non-zero digits and certain zeros.
Q2How many sig figs in 0.00450?
3 significant figures (4, 5, and the trailing 0). Leading zeros are not significant.
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