Significant Figures & Rounding Calculator
Count significant digits, convert scientific notation, and round numbers with clear precision rules.
Significant-figure mode explains which zeros count and why, so precision rules are visible instead of hidden.
Notation Analysis Results
5Significant Figures
Rules Applied:
Since a decimal is present, all digits starting from the first non-zero digit (4) to the end are significant.
Frequently Asked Questions
What is scientific notation?
Scientific notation expresses very large or very small numbers as a × 10^b, where 1 ≤ |a| < 10.
Are trailing zeros significant?
Trailing zeros are significant only if there is a decimal point. For example, 4500 has 2 significant figures, but 4500.0 has 5 significant figures.