basic

Significant Figures Calculator

Count and round to significant figures.

Count the significant figures in a number and round it to a chosen number of significant figures with optional scientific notation.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

All non-zero digits count. Trailing zeros after a decimal count. Leading zeros never count.

In depth

Count the significant figures in a number and round it to a chosen number of significant figures with optional scientific notation.