Scientific Notation & Significant Figures

Convert numbers to scientific and engineering notation, count significant figures and round to any number of sig figs.

How to use the Scientific Notation & Significant Figures

Enter or select: Number, Round to significant figures.
The results (Scientific notation, Engineering notation, Significant figures in input, Rounded) are calculated instantly as you type.
Use “Copy link” to share the calculation with the same input values.

Formula

x = m × 10ⁿ, 1 ≤ |m| < 10

About this tool

Leading zeros are never significant; trailing zeros are significant only when a decimal point is present.