Scientific Notation Converter
Convert numbers to and from scientific (standard form) notation.
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How it works
Enter a number in either form and the tool converts it. A plain decimal becomes scientific notation — a coefficient between 1 and 10 times a power of ten (for example 0.00042 becomes 4.2 × 10⁻⁴). Scientific or E-notation input is expanded back to a plain decimal. It also shows the E-notation form (4.2e-4) used in code. This is the standard way to write very large or very small numbers compactly. All conversion runs in your browser.
4200 = 4.2 × 10³ 0.00042 = 4.2 × 10⁻⁴
Common use cases
- Writing a very large or very small measurement compactly.
- Expanding E-notation from code into a readable number.
- Checking scientific-notation homework.
Frequently asked questions
What is E-notation?
E-notation is how programming languages write scientific notation: 4.2e-4 means 4.2 × 10⁻⁴. The tool shows both the × 10ⁿ form and the e form.
Does it keep precision?
It preserves the significant digits you enter. Extremely long decimals may be limited by standard floating-point precision, which the tool notes when relevant.
Can it expand notation back to a plain number?
Yes. Enter a value like 6.022e23 or 4.2 × 10^-4 and it writes out the full decimal form.