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Metric Prefix Converter

Move between kilo, mega, milli, micro, nano and every SI prefix — exactly.

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Quick Tool Overview

The Metric Prefix Converter moves a value between any two of the 25 SI prefixes, from quecto to quetta, by shifting the decimal point on the digits themselves so every result is exact.

What it does
Converts between SI metric prefixes
You give it
A value, two prefixes and optionally a unit
You get back
The exact result and the value under every prefix
Best for
Electronics, science and engineering units
Converters Free, unlimited use No sign-up Runs in your browser

About the Metric Prefix Converter

Metric prefixes are how the SI system scales one unit across thirty orders of magnitude: a kilo is a thousand, a milli a thousandth, a micro a millionth. Moving between two prefixes is only a matter of shifting the decimal point — but counting the places correctly is exactly where mistakes happen.

Enter a value, choose the prefix it has and the prefix you want, and optionally the unit — ohms, farads, metres, bytes, anything. The converter shifts the decimal point on the digits themselves rather than doing floating-point arithmetic, so 2.2 µF becomes exactly 2200 nF with no rounding noise. It covers all 25 prefixes, including ronna, quetta, ronto and quecto added in 2022, and lists the value under every prefix at once.

Key features of the Metric Prefix Converter

Exact decimal results

Digits are shifted rather than multiplied in floating point, so there is never any rounding noise.

All 25 prefixes

Includes ronna, quetta, ronto and quecto, added to the SI in 2022.

Any unit

Type a unit symbol — Ω, F, Hz, m, W — and it is attached to every result.

Shows the shift

The result explains how many places the decimal point moved and in which direction.

Every prefix at once

A table lists the value under all prefixes with their powers of ten.

How to use the Metric Prefix Converter

  1. 1

    Enter the value

    Any plain number, including negatives and E notation such as 6.02e23.

  2. 2

    Choose both prefixes

    Pick the prefix the value has and the one you need.

  3. 3

    Add the unit

    Type a unit symbol such as Ω, F, m or W so results read naturally.

  4. 4

    Read or copy

    See how many places the point moved, and copy the value under any prefix from the table.

Frequently asked questions

Multiply by 1,000. There are a thousand micro-units in one milli-unit, so 2.5 mA is 2,500 µA.

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