Popular si prefixes conversions
- Kilo to mega1 k = 0.001 M
- Kilo to milli1 k = 1,000,000 m
- Kilo to micro1 k = 1,000,000,000 µ
- Kilo to nano1 k = 1,000,000,000,000 n
- Kilo to giga1 k = 0.000001 G
- Mega to kilo1 M = 1,000 k
- Mega to milli1 M = 1,000,000,000 m
- Mega to micro1 M = 1,000,000,000,000 µ
- Mega to nano1 M = 1×10¹⁵ n
- Mega to giga1 M = 0.001 G
- Milli to kilo1 m = 0.000001 k
- Milli to mega1 m = 1×10⁻⁹ M
- Milli to micro1 m = 1,000 µ
- Milli to nano1 m = 1,000,000 n
- Milli to giga1 m = 1×10⁻¹² G
- Micro to kilo1 µ = 1×10⁻⁹ k
- Micro to mega1 µ = 1×10⁻¹² M
- Micro to milli1 µ = 0.001 m
- Micro to nano1 µ = 1,000 n
- Micro to giga1 µ = 1×10⁻¹⁵ G
- Nano to kilo1 n = 1×10⁻¹² k
- Nano to mega1 n = 1×10⁻¹⁵ M
- Nano to milli1 n = 0.000001 m
- Nano to micro1 n = 0.001 µ
- Nano to giga1 n = 1×10⁻¹⁸ G
- Giga to kilo1 G = 1,000,000 k
- Giga to mega1 G = 1,000 M
- Giga to milli1 G = 1,000,000,000,000 m
- Giga to micro1 G = 1×10¹⁵ µ
- Giga to nano1 G = 1×10¹⁸ n
About si prefixes units
SI prefixes multiply any SI unit by a power of ten. The four newest — ronna, quetta, ronto and quecto — were adopted in 2022. Use this to answer questions like “how many micro in a milli?” for any unit.
SI Prefixes unit reference
| Unit | Symbol | Value in — | System |
|---|---|---|---|
| Quetta | Q | 1×10³⁰ — | SI |
| Ronna | R | 1×10²⁷ — | SI |
| Yotta | Y | 1×10²⁴ — | SI |
| Zetta | Z | 1×10²¹ — | SI |
| Exa | E | 1×10¹⁸ — | SI |
| Peta | P | 1×10¹⁵ — | SI |
| Tera | T | 1,000,000,000,000 — | SI |
| Giga | G | 1,000,000,000 — | SI |
| Mega | M | 1,000,000 — | SI |
| Kilo | k | 1,000 — | SI |
| Hecto | h | 100 — | SI |
| Deca | da | 10 — | SI |
| Base unit (no prefix) | — | 1 — | SI |
| Deci | d | 0.1 — | SI |
| Centi | c | 0.01 — | SI |
| Milli | m | 0.001 — | SI |
| Micro | µ | 0.000001 — | SI |
| Nano | n | 1×10⁻⁹ — | SI |
| Pico | p | 1×10⁻¹² — | SI |
| Femto | f | 1×10⁻¹⁵ — | SI |
| Atto | a | 1×10⁻¹⁸ — | SI |
| Zepto | z | 1×10⁻²¹ — | SI |
| Yocto | y | 1×10⁻²⁴ — | SI |
| Ronto | r | 1×10⁻²⁷ — | SI |
| Quecto | q | 1×10⁻³⁰ — | SI |
Frequently asked questions
What is the SI unit of si prefixes?
This converter uses the base unit (—) as its reference unit; every other unit is defined relative to it.
How many si prefixes units can I convert?
25 units are supported here, across SI systems. Every pair can be converted in both directions.
Does this si prefixes converter work offline?
Yes. Once the page has loaded, every calculation runs locally in your browser — nothing is sent to a server.