Significant Figures & Rounding Calculator
Count significant digits, convert scientific notation, and round numbers with clear precision rules.
Scientific-notation mode converts standard decimals into scientific and engineering notation for science and calculator entry.
Notation Analysis Results
Scientific Notation1.25 × 10^+6
Engineering Notation1.25 × 10^6
Standard Decimal1,250,000
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.