Metric Prefix Converter

Convert a number between any two metric (SI) prefixes, from quecto (10⁻³⁰) to quetta (10³⁰).

How to use the Metric Prefix Converter

  1. Type the value you want to convert in the first box.
  2. Choose the unit you are converting from and the unit you want to convert to.
  3. Read the result instantly. Use the swap button to reverse the direction, or copy the result with one click.

Supported metric prefix units

UnitSymbolEqual to
QuettaQ1 × 1030 –
RonnaR1 × 1027 –
YottaY1 × 1024 –
ZettaZ1 × 1021 –
ExaE1 × 1018 –
PetaP1 × 1015 –
TeraT1,000,000,000,000 –
GigaG1,000,000,000 –
MegaM1,000,000 –
Kilok1,000 –
Hectoh100 –
Decada10 –
Base unit (no prefix)–1 –
Decid0.1 –
Centic0.01 –
Millim0.001 –
Microµ0.000001 –
Nanon0.000000001 –
Picop1 × 10-12 –
Femtof1 × 10-15 –
Attoa1 × 10-18 –
Zeptoz1 × 10-21 –
Yoctoy1 × 10-24 –
Rontor1 × 10-27 –
Quectoq1 × 10-30 –

How metric prefixes work

A metric prefix multiplies a unit by a power of ten. “Kilo” means 1,000, so a kilometer is 1,000 meters and a kilogram is 1,000 grams. “Milli” means one thousandth, so a millimeter is 0.001 meters. The same prefixes work with every SI unit: watts, hertz, bytes, liters, volts and so on.

To convert between two prefixes, multiply by the ratio of their factors. Mega to kilo is 106 ÷ 103 = 1,000, so 5 megawatts equal 5,000 kilowatts.

In 2022 four new prefixes were added: ronna (1027), quetta (1030), ronto (10−27) and quecto (10−30).

Frequently asked questions

What is the order of metric prefixes?

From large to small: giga, mega, kilo, hecto, deca, (base unit), deci, centi, milli, micro, nano, pico. Each main step is a factor of 1,000.

How do I convert micro to milli?

Divide by 1,000. For example, 500 micrograms equal 0.5 milligrams.

What comes after giga?

Tera (10¹²), then peta, exa, zetta, yotta, ronna and quetta (10³⁰).

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