Convert to and from scientific notation. This free converter turns ordinary numbers into a × 10ⁿ form (and back), and also shows engineering and E-notation.
Convert
Enter an ordinary number to convert it into scientific notation (a × 10ⁿ, with 1 ≤ |a| < 10), plus engineering and E-notation forms.
×10^
Enter the coefficient and exponent of a × 10ⁿ to convert it back to an ordinary decimal number.
Scientific notation
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Enter a number
Scientific notation writes a number as a coefficient between 1 and 10 times a power of ten. Engineering notation uses exponents that are multiples of 3 (matching SI prefixes like kilo, mega, milli).
Use this free scientific notation converter to turn an ordinary number into scientific notation, or convert scientific notation back to a decimal. It also gives engineering and E-notation forms.
What this scientific notation converter does
A scientific notation converter rewrites very large or very small numbers compactly as a × 10ⁿ, where the coefficient a is between 1 and 10. It converts both ways and also shows engineering notation and E-notation.
How scientific notation works
Move the decimal point so one non-zero digit is in front,
then count the places moved = the exponent n.
0.00045 → 4.5 × 10⁻⁴ 92,500,000 → 9.25 × 10⁷
A positive exponent means a large number (decimal moved left); a negative exponent means a small one (decimal moved right).
Notation forms compared
Form
0.00045
Scientific
4.5 × 10⁻⁴
E-notation
4.5e-4
Engineering
450 × 10⁻⁶
Decimal
0.00045
Scientific vs engineering notation
Scientific notation keeps the coefficient between 1 and 10. Engineering notation instead uses exponents that are multiples of 3, lining up with SI prefixes (kilo 10³, mega 10⁶, milli 10⁻³), which is handy in engineering and electronics.
How to use the converter
Pick a direction — from decimal or from scientific.
Enter your number (or the coefficient and exponent).
Read the converted result in every form.
Scientific Notation FAQ
How do I convert a number to scientific notation?
Move the decimal point until one non-zero digit remains in front, then the number of places you moved is the exponent. 92,500,000 becomes 9.25 × 10⁷.
How do I convert scientific notation back to a decimal?
Multiply the coefficient by 10 raised to the exponent. 4.5 × 10⁻⁴ is 0.00045. Switch to "from scientific" mode and enter both parts.
What does a negative exponent mean?
It means a small number less than 1 — the decimal point moves to the right. 3 × 10⁻⁸ is 0.00000003.
What is E-notation?
A calculator-friendly way to write scientific notation, where "× 10ⁿ" is replaced by "e". So 4.5 × 10⁻⁴ is written 4.5e-4.
What's the difference from engineering notation?
Engineering notation uses exponents that are multiples of 3 (like 10³ or 10⁻⁶) to match SI prefixes, while scientific notation keeps the coefficient between 1 and 10.
Is the scientific notation converter free?
Yes, this scientific notation converter is completely free, needs no sign-up, and gives instant results in your browser.
