Scientific Notation Converter
The Scientific Notation Converter rewrites any number in scientific notation (standard form), engineering notation, E-notation and plain decimal.
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Paste a decimal like 1234567 or a value already in scientific form and get every notation at once, rounded to the significant digits you choose.
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How to Use
Enter a number
Type a decimal number such as 0.00042, or a value already written in scientific form like 6.02 × 10^23 or 6.02e23.
Set significant digits
Choose how many significant digits to round the mantissa to, from 1 to 15.
Read every notation
See the number in scientific, engineering, E-notation and decimal form side by side, updating as you type.
Copy what you need
Copy any single form with its button, or use Copy All to grab every notation at once.
Frequently Asked Questions
What is scientific notation?
Scientific notation (also called standard form) writes a number as a mantissa between 1 and 10 multiplied by a power of ten, such as 1.23 × 10^6. It makes very large and very small numbers compact and easy to compare.
How is engineering notation different?
Engineering notation is like scientific notation but the exponent is always a multiple of three, so the mantissa sits between 1 and 1000. This lines the powers up with metric prefixes like kilo (10^3), mega (10^6) and micro (10^-6).
What is E-notation?
E-notation is the machine-readable form of scientific notation, where "× 10^" is replaced by the letter e — so 1.23 × 10^6 becomes 1.23e6. It is what calculators, spreadsheets and programming languages use.
How many significant digits should I use?
Use as many as your source data justifies. The converter lets you pick between 1 and 15 significant digits and rounds the mantissa accordingly, so you can match the precision of your measurement.