Contents 
SI is an abbreviation of Système International (d'Unités) [International System (of Units)] and is a standard metric system of units adopted for official scientific use. For more information, see Wikipedia's article on SI.
Note: this page is simply a collection of links to the names of SI units and their prefixes and multiples. For further information, see the Wikipedia articles SI base units and SI derived units.


prefix  sym  multiplier  notes 

yotta  Y  10^{24}  
zetta  Z  10^{21}  
exa  X  10^{18}  
peta  P  10^{15}  
tera  T  10^{12}  
giga  G  10^{9}  
mega, meg  M  10^{6}  1 
kilo  k  10^{3}  
hecto  h  10^{2}  2 
deca, deka  da  10^{1}  2 
deci  d  10^{–1}  
centi  c  10^{–2}  
milli  m  10^{–3}  
micro  µ, u  10^{–6}  
nano  n  10^{–9}  
pico  p  10^{–12}  
femto  f  10^{–15}  
atto  a  10^{–18}  
zepto  z  10^{–21}  
yocto  y  10^{–24} 
Notes:
The following prefixes are not part of SI. They were adopted by the IEC to express binary multiples.
prefix  sym  multiplier 

exbi  Ei  2^{60} 
pebi  Pi  2^{50} 
tebi  Ti  2^{40} 
gibi  Gi  2^{30} 
mebi  Mi  2^{20} 
kibi  Ki  2^{10} 
These prefixes were never part of SI.
prefix  multiplier  equivalent 

hectokilo  10^{5}  
myria  10^{4}  
millimilli  10^{–6}  micro 
millimicro  10^{–9}  nano 
micromicro  10^{–12}  pico 
(Sources: ; Oxford English Dictionary, 2nd ed.)
Y  Z  E  P  T  G  M  k  h  da  Unit  d  c  m  μ  n  p  f  a  z  y 

MA  kA  A  mA  μA  nA  
PBq  TBq  GBq  Bq  
C  
°C  
cd  
F  mF  μF  nF  pF  
t, Mg  kg  hg  dag  g  dg  cg  mg  μg  
Gy  
H  mH  μH  nH  
PHz  THz  GHz  MHz  kHz  Hz  
kJ  J  
K  
kat  
lm  
klx  lx  
km  hm  dam  m  dm  cm  mm  μm  nm  pm  fm  
mol  mmol  μmol  
MN  kN  N  
GΩ  MΩ  kΩ  Ω  mΩ  
GPa  MPa  kPa  hPa  Pa  
rad  mrad  
S  
s  ms  μs  ns  ps  fs  as  
sr  
Sv  mSv  µSv  
T  mT  µT  nT  
MV  kV  V  mV  μV  
GW  MW  kW  W  mW  μW  
kWb  Wb  mWb  μWb 
