Scientific Notation Converter
Convert between decimals and scientific notation.
Result
2.99792458 × 10^8
Free online scientific notation converter. Turn a plain decimal number into scientific (standard-form) notation, or expand a mantissa and exponent back into a decimal. Runs in your browser.
How to use the Scientific Notation Converter
- 01Choose Decimal → Scientific or Scientific → Decimal.
- 02Enter your number, or the mantissa and exponent.
- 03The converted value appears instantly — copy it.
Frequently asked questions
What is scientific notation?
Scientific notation writes a number as a mantissa between 1 and 10 multiplied by a power of ten, such as 6.022 × 10²³. It makes very large and very small numbers easier to read.
What is the mantissa and exponent?
In m × 10^e, the mantissa m carries the significant digits and the exponent e is the power of ten. Enter both to expand the value back to an ordinary decimal.