Scientific Notation Converter
Convert numbers to and from scientific notation, free and in your browser — mantissa times ten, plus E-notation, both directions.
Report a problemScientific notation writes a number as a mantissa between 1 and 10 multiplied by a power of ten — handy for very large or very small values. This tool also shows the E-notation form (for example 1.2345678 e+4) that calculators and code use.
How to use
- Type a number in the box — either a plain decimal like 12345.678 or a scientific value like 1.23e4 or 1.23 × 10^4.
- Pick a direction: decimal to scientific notation, or scientific notation back to a plain decimal. The result updates live as you type.
- Read the result: the big line is the converted number, the line below shows the alternative form, and the cards break out the mantissa, exponent and sign.
FAQ
What is scientific notation?
Scientific notation writes any number as a mantissa multiplied by a power of ten, where the mantissa is at least 1 and less than 10. For example 12,345.678 becomes 1.2345678 × 10^4, and 0.00042 becomes 4.2 × 10^-4. It keeps very large and very small numbers short and easy to compare. The same value in E-notation — the form calculators and code use — is written 1.2345678e+4. This converter shows both forms and the exponent, and it also goes the other way, turning scientific notation back into an ordinary decimal.
What inputs does the scientific-to-decimal mode accept?
It understands the common ways people write scientific notation: 1.23e4, 1.23E4, 1.23 x 10^4 and 1.23 × 10^4 all work, and the exponent can be negative. Negative numbers and zero are handled too. If the text cannot be read as a number, the result simply waits rather than showing an error.
Is anything I type uploaded?
No — it runs in your browser. Your number is converted with plain arithmetic on your own device, nothing is sent to a server or stored, and the tool keeps working offline.