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Prefixes for measurement units

Synonyms: SI prefix

Prefixes can be applied to a measurement unit, usually a SI unit, to form a decimal multiple or submultiple.

Abbreviation Name Origin Value

Y

Yotta ital. otto = eight(103)8 = 1024 1 000 000 000 000 000 000 000 000 European quadrillion (long scale)
American septillion (short scale)

Z

Zetta ital. sette = seven (103)7 = 1021 1 000 000 000 000 000 000 000 European trilliard (long scale)
American sextillion (short scale)

E

Exa gr. εξάκις, hexákis = six times (103)6 = 1018 1 000 000 000 000 000 000 European trillion (long scale)
American quintillion (short scale)

P

Peta gr. πεντάκις, pentákis = five times (103)5 = 1015 1 000 000 000 000 000 European billiard (long scale)
American quadrillion (short scale)

T

Tera gr. τέρας, téras = monstrous / tetrákis = four times (103)4 = 1012 1 000 000 000 000 European billion (long scale)
American trillion (short scale)

G

Giga gr. γίγας, gígas = Giant (103)3 = 109 1 000 000 000 European milliard (long scale)
American billion (short scale)

M

Mega gr. μέγας, mégas = large (103)2 = 106 1 000 000 Million

k

Kilo gr. χίλιοι, chílioi = a thousand 103 1 000 one thousand

h

Hekto gr. εκατόν, hekatón = a hundred 102 100 one hundred

da

Deka gr. δέκα, déka = ten 101 10 ten
– 100 1 one

d

Dezi lat. decimus = tenth 10-1 0,1 one tenth

c

Zenti lat. centesimus = hundredth 10-2 0,01 one hundreth

m

Milli lat. millesimus = thousandth 10-3 0,001 one thousandth

μ

Mikro gr. μικρός, mikrós = snakk (10-3)2 = 10-6 0,000 001 one millionth

n

Nano gr. νάνος, nános und ital. nano = dwarf (10-3)3 = 10-9 0,000 000 001 one European milliardth (American billionth)

p

Piko ital. piccolo = small (10-3)4 = 10-12 0,000 000 000 001 one European billionth (American trillionth)

f

Femto skand. femton = fifteen (10-3)5 = 10-15 0,000 000 000 000 001 one european biiliardth (American quadrillionth)

a

Atto skand. arton = eighteen (10-3)6 = 10-18 0,000 000 000 000 000 001 one European trillionth (American quintillionth)

z

Zepto lat. septem = seven (10-3)7 = 10-21 0,000 000 000 000 000 000 001 one European trilliardth (American sextillionth)

y

Yokto lat. octo = egith (10-3)8 = 10-24 0,000 000 000 000 000 000 000 001 one European quadrillionth (American septillionth)


Binary prefixes are used in computer science and information theory:

</td></tr>
 Symbol   Name  Value
      Ki   kibi  210 = 10241 = 1.024
      Mi   mebi  220 = 10242 = 1.048.576
      Gi   gibi  230 = 10243 = 1.073.741.824
      Ti   tebi  240 = 10244 = 1.099.511.627.776
      Pi   pebi  250 = 10245 = 1.125.899.906.842.624
      Ei   exbi  260 = 10246 = 1.152.921.504.606.846.976 
      Zi   zebi  270 = 10247 = 1.180.591.620.717.411.303.424 
      Yi   yobi  280 = 10248 = 1.208.925.819.614.629.174.706.176 

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