Scientific Figure Calculator

Enter it exactly as written; trailing zeros and the decimal point change the precision.
Significant figures
4
Significant Figures Calculator
Decimal places
6
Rounded value
0.0045
Rounded value as written
0.004500
Scientific notation
4.500 x 10^-3
Rule applied
Counted as written; rounded to 4 significant figures.
Worked out from OpenStax, Chemistry 2e §1.5 "Measurement Uncertainty, Accuracy, and Precision" — rules for counting significant figures and for reporting products, quotients, sums and differences and 1 other source.

How this is worked out

4 steps
  1. Written form: 0.004500
  2. Significant digits: 4 (leading zeros discarded).
  3. Decimal places as written: 6
  4. Rounded to 4 significant figures: 0.004500

Results are general information, not financial, tax, legal, medical or engineering advice.