Count the number of significant figures and round numbers with scientific precision.
Numeric Data
Analysis Results
4
Sig Fig Count
Evaluations based on standard scientific rounding rules.
Rounded Result0.00456
Scientific Form4.56e-3
Digit Significance
0.004560
About this calculator
What are Significant Figures?
Significant figures (sig figs) are the digits in a number that carry meaningful information about its precision. This includes all non-zero digits, zeros between significant digits, and trailing zeros in a decimal number.
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Pro Tips
Leading zeros (e.g., 0.005) are NOT significant.
Captive zeros (e.g., 105) are ALWAYS significant.
Trailing zeros in a number WITHOUT a decimal point (e.g., 500) are usually ambiguous but often treated as non-significant.
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Fun Facts
"Significant figures help communicate the certainty of a measurement instrument."
"Calculators often give many 'superfluous' digits that aren't actually justified by the data."
"In some fields, a bar is placed over the last significant zero (e.g., 50̄0) to remove ambiguity."
