Count significant figures in any number and round to a specified number of sig figs. Includes scientific notation conversion and detailed explanations.
Number of Significant Figures
4.00
The number "0.004560" has 4 significant figures
Significant Digits
4, 5, 6, 0
The digits that are considered significant
Scientific Notation
4.56 × 10^-3
The number expressed in scientific notation
Rounded to 1 Sig Fig
0.005
0.004560 rounded to 1 significant figure
Rounded to 2 Sig Figs
0.0046
0.004560 rounded to 2 significant figures
Rounded to 3 Sig Figs
0.00456
0.004560 rounded to 3 significant figures
Rounded to 4 Sig Figs
0.00456
0.004560 rounded to 4 significant figures