Physics reference
SI prefixes |
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A comphrensive table of all SI multiples and submultiples. | ||
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SI prefixes. | ||
prefix | symbol | value | expanded value | English name | adopted (obsoleted) |
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quetta | Q | 1030 | 1 000 000 000 000 000 000 000 000 000 000 | U.S. nonillion | 2022 |
ronta | R | 1027 | 1 000 000 000 000 000 000 000 000 000 | U.S. octillion | 2022 |
yotta | Y | 1024 | 1 000 000 000 000 000 000 000 000 | U.S. septillion | 1991 |
zetta | Z | 1021 | 1 000 000 000 000 000 000 000 | U.S. sextillion | 1991 |
exa | E | 1018 | 1 000 000 000 000 000 000 | U.S. quintillion | 1975 |
peta | P | 1015 | 1 000 000 000 000 000 | U.S. quadrillion | 1975 |
tera | T | 1012 | 1 000 000 000 000 | U.S. trillion | 1960 |
giga | G | 109 | 1 000 000 000 | U.S. billion | 1960 |
mega | M | 106 | 1 000 000 | million | 1960 |
myria/myrio | my [footnote 1] | 104 | 10 000 | ten thousand | 1795/1889 (1960) |
kilo | k | 103 | 1 000 | thousand | 1795/1889 |
hecto | h | 102 | 100 | hundred | 1795/1889 |
deca/deka | da [footnote 2] | 101 | 10 | ten | 1795/1889 |
100 | 1 | one | |||
deci | d | 10-1 | 0.1 | tenth | 1795/1889 |
centi | c | 10-2 | 0.01 | hundredth | 1795/1889 |
milli | m | 10-3 | 0.001 | thousandth | 1795/1889 |
micro | μ (u) [footnote 3] | 10-6 | 0.000 001 | millionth | 1960 |
nano | n | 10-9 | 0.000 000 001 | U.S. billionth | 1960 |
pico | p | 10-12 | 0.000 000 000 001 | U.S. trillionth | 1960 |
femto | f | 10-15 | 0.000 000 000 000 001 | U.S. quadrillionth | 1964 |
atto | a | 10-18 | 0.000 000 000 000 000 001 | U.S. quintillionth | 1964 |
zepto | z | 10-21 | 0.000 000 000 000 000 000 001 | U.S. sextillionth | 1991 |
yocto | y | 10-24 | 0.000 000 000 000 000 000 000 001 | U.S. septillionth | 1991 |
ronto | r | 10-27 | 0.000 000 000 000 000 000 000 000 001 | U.S. octillionth | 2022 |
quecto | q | 10-30 | 0.000 000 000 000 000 000 000 000 000 001 | U.S. nonillionth | 2022 |
Legend. | |||
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Footnotes. | |||
1. The myria prefix (also spelled myrio) was originally introduced in the metric system in 1795 and approved in the first General Conference on Weights and Measures (GCPM) in 1889, but was declared obsolete in 1960.
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footnote 1 | ||
2. The deca prefix is spelled deka in British English. Spellings may vary, but its official symbol is always da, not dk.
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footnote 2 | ||
3. The micro prefix is actually represented by the Greek letter mu, but is often written in ASCII as u.
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footnote 3 | ||
Cross-references. | |||
Physics reference: Binary prefixes A comphrensive table of all binary multiples. |
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