Engineering notation converter
Engineering notation lines up with kilo, mega, milli and micro, which is why electrical and electronics work uses it for component values.
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How to use it
- Enter number and significant figures (optional).
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Number = m × 10ⁿ where n is a multiple of 3 and 1 ≤ |m| < 1000. Take the scientific exponent, lower it to the multiple of 3 at or below it and adjust m.
Example
Inputs: Number = 0.00047. Result: Engineering notation: 470 × 10⁻⁶; Exponent: -6.
0.00047
470 × 10⁻⁶
Limits and caveats
- SI prefixes exist only from quecto q (10⁻³⁰) to quetta Q (10³⁰).
- Engineering form can hide significant figures: 470 may mean two or three of them.
Questions about this tool
How is engineering notation different from scientific notation?
Scientific notation keeps the coefficient between 1 and 10 with any exponent. Engineering notation uses exponents that are multiples of 3 and a coefficient from 1 to below 1000.
How do I write 0.00047 farads in engineering notation?
It is 470 × 10⁻⁶ F, which is 470 microfarads (470 µF).
Why do engineers use multiples of 3?
Each common SI prefix such as kilo, mega or milli is 1000 times the next, so the value reads straight off the prefix.