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Scientific Notation Converter

Write any number in scientific, E and engineering notation, or turn scientific notation back into an ordinary number.

Your numbers are saved in this browser.

Ordinary or scientific: 1,500,000 or 6.02e23 or 6.02 × 10^23.

0 keeps every digit you typed.

Scientific notation

4.5 × 10^-5

E notation
4.5e-5
Engineering notation
45 × 10^-6
Written out
0.000045

0.000045 is 4.5 × 10^-5 in scientific notation.

How it's worked out

  1. Move the decimal point5 places to the rightexponent -5
  2. Significant figuresas typed4.5

How to convert

Move the decimal point until one non-zero digit is left of it. The number of places moved is the power of 10: positive if you moved left, negative if you moved right.

Worked example

0.000045: move the point 5 places right to get 4.5, so it's 4.5 × 10⁻⁵, or 4.5e-5. To 3 significant figures, 999.96 becomes 1.00 × 10³.

Questions people ask

What is scientific notation?

A number written as a value from 1 to under 10, times a power of 10. 0.000045 is 4.5 × 10⁻⁵ and 1,500,000 is 1.5 × 10⁶.

What is E notation?

The calculator and spreadsheet form of scientific notation: 4.5e-5 means 4.5 × 10⁻⁵.

What is engineering notation?

Like scientific notation, but the power of 10 is always a multiple of 3, matching units such as kilo, mega and micro: 45 × 10⁻⁶.

Formula and rules last checked 25 October 2026Written and tested by the CalcPenguin teamReport a problem