Scientific Figure Calculator
Scientific figure calculator works out Significant figures and Decimal places from Task, Number (as written) and First value (as written). The default figures on this page give significant figures of 4; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Written form: 0.004500
- Significant digits: 4 (leading zeros discarded).
- Decimal places as written: 6
- Rounded to 4 significant figures: 0.004500
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the scientific figure calculator calculates
Counts the significant figures in a number as written, rounds it to a required number of significant figures, and applies the multiplication/division and addition/subtraction reporting rules to a calculation.
How to use this scientific figure calculator
Enter Task, Number (as written), First value (as written) and Second value (as written). Significant figures updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Significant figures, Decimal places and Rounded value.
The method follows OpenStax, Chemistry 2e §1.5 "Measurement Uncertainty, Accuracy, and Precision" — rules for counting significant figures and for reporting products, quotients, sums and differences and NIST Special Publication 811, Guide for the Use of the International System of Units, Appendix B.7 (significant digits and rounding of converted values).
0.004500 has 4 significant figures example
With Task: analyze, Number (as written): 0.004500, Round to this many significant figures: 4, the calculator returns Significant figures: 4, Rounded value as written: 0.004500. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Significant figures, Decimal places and Rounded value. The inputs you can vary are Task, Number (as written), First value (as written), Second value (as written) and Operation.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What information do I need for the scientific figure calculator?
You need Task, Number (as written), First value (as written), Second value (as written) and Operation. The page opens with default figures that give significant figures of 4, so you can see the scale before entering your own.
What does this scientific figure calculator show?
It shows Significant figures, Decimal places, Rounded value, Rounded value as written, Scientific notation, Result reported to the correct precision, Result as written and Unrounded result, with the working and any warnings for your entries.
Can I check how the scientific figure calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.