Converters · SI prefixes
SI prefix converter.
Move a value from one metric prefix to another: pF to nF, mA to A, kHz to MHz, mm to km or GB to TB. All 24 SI prefixes from quecto to quetta are included. The conversion shifts the decimal point exactly, so there is no rounding. Runs in your browser; nothing is sent.
2200 pF is 2.2 nF: pico is 10−12 and nano is 10−9, so going from pico to nano divides by 103. And 4.7 kΩ is 4700 Ω because kilo is 103.
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How SI prefixes work
An SI prefix is a name and symbol placed in front of a unit to multiply it by a power of ten: a kilometre is 103 metres and a nanometre is 10−9 metres. To convert between prefixes, compare the exponents: moving from a prefix with exponent a to one with exponent b multiplies the number by 10a − b. Going from kilo (3) to the base unit (0) multiplies by 103, so 4.7 kΩ = 4700 Ω. Going from pico (−12) to nano (−9) multiplies by 10−3, so 2200 pF = 2.2 nF.
Worked examples
2200 pF → nF = 2.2 nF. 4.7 kΩ → Ω = 4700 Ω. 500 mA → A = 0.5 A. 2.2 µF → nF = 2200 nF. 0.047 MHz → µHz = 4.7 × 1010 µHz. 1 THz → pHz = 1024 pHz.
For bytes, kilobytes and so on see the storage unit size calculator. To write a result as a number times a power of ten, or in engineering notation with an exponent divisible by three, see the scientific notation calculator.
The SI prefixes
| Prefix | Symbol | Power of ten | Name of the number |
|---|---|---|---|
| quetta | Q | 1030 | nonillion |
| ronna | R | 1027 | octillion |
| yotta | Y | 1024 | septillion |
| zetta | Z | 1021 | sextillion |
| exa | E | 1018 | quintillion |
| peta | P | 1015 | quadrillion |
| tera | T | 1012 | trillion |
| giga | G | 109 | billion |
| mega | M | 106 | million |
| kilo | k | 103 | thousand |
| hecto | h | 102 | hundred |
| deka | da | 101 | ten |
| deci | d | 10−1 | tenth |
| centi | c | 10−2 | hundredth |
| milli | m | 10−3 | thousandth |
| micro | μ | 10−6 | millionth |
| nano | n | 10−9 | billionth |
| pico | p | 10−12 | trillionth |
| femto | f | 10−15 | quadrillionth |
| atto | a | 10−18 | quintillionth |
| zepto | z | 10−21 | sextillionth |
| yocto | y | 10−24 | septillionth |
| ronto | r | 10−27 | octillionth |
| quecto | q | 10−30 | nonillionth |
Symbols are case-sensitive. Prefixes for submultiples use lowercase symbols, and prefixes for multiples use uppercase symbols except kilo (k), hecto (h) and deka (da). So m is milli and M is mega, p is pico and P is peta.
Sources, opened 8 October 2026: NIST Office of Weights and Measures, Metric (SI) Prefixes (the table of 24 SI prefixes from quecto 10−30 to quetta 1030 with names, symbols and powers of ten, the 2022 additions ronna, quetta, ronto and quecto, and the capitalization rule for symbols).
Note: The prefixes and exponents are those on the NIST page; the 2022 additions ronna, quetta, ronto and quecto are included. Binary prefixes such as kibi and mebi are not included.
Frequently asked questions
How do you convert pF to nF?
Divide by 1,000. Pico is 10^-12 and nano is 10^-9, so 2200 pF is 2.2 nF.
How do you convert milli to micro?
Multiply by 1,000. Milli is 10^-3 and micro is 10^-6, so 0.5 mA is 500 uA.
How many nano are in a micro?
One micro is 1,000 nano, because micro is 10^-6 and nano is 10^-9. In the same way one milli is 1,000 micro and one kilo is 1,000 base units.
What is the order of the SI prefixes?
From small to large: quecto, ronto, yocto, zepto, atto, femto, pico, nano, micro, milli, centi, deci, then the base unit, then deka, hecto, kilo, mega, giga, tera, peta, exa, zetta, yotta, ronna and quetta.
What does the prefix tera mean?
Tera means 10^12, which is a trillion in the short scale. 1 THz is 10^12 Hz.
Are SI prefixes case-sensitive?
Yes. The lowercase m is milli (10^-3) and the uppercase M is mega (10^6), so mW and MW differ by a factor of a billion.