International System (SI) prefixes

Search an SI prefix and read the corresponding power of ten.

What it's for

SI prefixes multiply or divide units by powers of ten: kilo = thousand, mega = one million, milli = one thousandth. Useful in physics, computing and everyday life.

Example

1 km = 1000 m, 1 MB ≈ one million bytes, 1 ms = one thousandth of a second.