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Metric system

SI prefixes
PrefixSymbol1000m10nDecimalShort scaleLong scaleScientific notationSince[n 1]
yottaY1000810241000000000000000000000000SeptillionQuadrillion1E241991
zettaZ1000710211000000000000000000000SextillionTrilliard1E211991
exaE1000610181000000000000000000QuintillionTrillion1E181975
petaP1000510151000000000000000QuadrillionBilliard1E151975
teraT1000410121000000000000TrillionBillion1E121960
gigaG100031091000000000BillionMilliard1E91960
megaM100021061000000Million1E61960
kilok100011031000Thousand1E31795
hectoh10002/3102100Hundred1E21795
decada10001/310110Ten1E11795
100001001One
decid1000−1/310−10.1Tenth1E-11795
centic1000−2/310−20.01Hundredth1E-21795
millim1000−110−30.001Thousandth1E-31795
microμ1000−210−60.000001Millionth1E-61960
nanon1000−310−90.000000001BillionthMilliardth1E-91960
picop1000−410−120.000000000001TrillionthBillionth1E-121960
femtof1000−510−150.000000000000001QuadrillionthBilliardth1E-151964
attoa1000−610−180.000000000000000001QuintillionthTrillionth1E-181964
zeptoz1000−710−210.000000000000000000001SextillionthTrilliardth1E-211991
yoctoy1000−810−240.000000000000000000000001SeptillionthQuadrillionth1E-241991
  1. ^ The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.
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