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Scientific Notation Converter

Convert numbers to scientific and E notation.

Try:
Scientific notation
4.5 × 10⁻⁵
E notation
4.5e-5
Engineering notation
45 × 10⁻⁶
With SI prefix
45 µ
micro
Significant figures
2

Decimal form

0.000045

How: move the decimal point until one non-zero digit is left of it. You moved it 5 places right, so the power of 10 is -5.

How to use

  1. 1Type a number like 0.000045 or 6.022e23.
  2. 2Choose significant figures if you need rounding.
  3. 3Read the scientific, E and engineering forms.
  4. 4Copy the full decimal form if needed.

Frequently asked questions

What is scientific notation?

A way to write numbers as a × 10ⁿ, where a is between 1 and 10. For example, 0.000045 = 4.5 × 10⁻⁵.

What is engineering notation?

Like scientific notation, but the power of 10 is always a multiple of 3, matching prefixes like kilo, mega and micro.

Is the conversion exact?

Yes. Digits are handled as text, so very large or very small numbers aren't rounded by the computer.

How do significant figures work here?

Choose a number and the result is rounded half up, keeping trailing zeros (999.96 to 3 s.f. is 1.00 × 10³).

Can I type 6.022 × 10^23?

Yes, as well as 6.022e23 or 6.022x10^23.

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