Significant Figures Calculator
Round numbers to significant figures and count sig figs in any number.
Input
Results
Original Significant Figures
6 sig figs
Rounded to 3 sig figs
123
Scientific Notation (3 sig figs)
1.23e+2
Significant Figures Rules
Significant
- • All non-zero digits (1-9)
- • Zeros between non-zero digits (101)
- • Trailing zeros after decimal point (2.00)
Not Significant
- • Leading zeros (0.005 has 1 sig fig)
- • Trailing zeros without decimal (100 has 1 sig fig)
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Handbook of Mathematical Functions
by Abramowitz & Stegun
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.