Significant Figures Calculator

Round to sig figs, count significant digits, evaluate expressions, and convert to scientific notation.

How It Works

  1. Enter a number and sig fig count. Type any value and how many significant figures to keep.
  2. Get rounded result. The calculator applies standard rounding rules to the correct precision.
  3. Count sig figs. Analyze any number to see how many significant digits it contains.
  4. Expression calculator. Evaluate math expressions and round the answer to your sig fig setting.
  5. Scientific notation. View standard, engineering, and E-notation formats of your rounded value.

Also try our Simplify Calculator or Math Calculators.

Enter values to see results.

Formula & Reference

Round to n sig figs ยท Count all certain + first uncertain digit