Metric prefix converter (kilo, mega, milli)
Works with any unit, metres, grams, watts, decimal bytes or hertz, because a prefix only changes the power of ten.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter value, from prefix and to prefix.
- 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
New value = value × 10^(from exponent - to exponent). For example 2.5 mega = 2.5 × 10^(6 - 3) kilo = 2500 kilo.
Example
Inputs: Value = 2.5, From prefix = mega M (10⁶), To prefix = kilo k (10³). Result: Converted value: 2500.
2.5
2500
Limits and caveats
- Decimal prefixes only; binary prefixes such as Ki and Mi for storage are not included.
- For squared or cubed units such as km² the exponent doubles or triples, so this tool does not apply directly.
Questions about this tool
How many kilo are in a mega?
One mega is 1000 kilo, since the exponents 6 and 3 differ by 3.
What are ronna and quetta?
They were added to the SI in 2022: ronna is 10²⁷ and quetta 10³⁰, along with ronto 10⁻²⁷ and quecto 10⁻³⁰.
Is u the symbol for micro?
The official symbol is µ; u is sometimes used when the Greek letter is not available.