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Significant Figures Calculator

Count, round, and calculate with significant figures

Example Numbers

📏Significant Figures Rules

Non-zero digits
Always significant (1, 2, 3...)
Leading zeros
Never significant (0.0123 = 3 sig figs)
Captive zeros
Always significant (105 = 3 sig figs)
Trailing zeros
Significant if after decimal point

🧮Calculation Rules

Addition & Subtraction
Result has same decimal places as the number with fewest decimal places
Multiplication & Division
Result has same number of sig figs as the number with fewest sig figs
Scientific Notation
Clear way to show exact number of sig figs (1.23 × 10³)
Exact Numbers
Have infinite sig figs (counted items, defined conversions)
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