John's Metric System Reference Page
I am a believer. I believe that the world would be a better and simpler
place to live if we could all agree on our system of units!
We would also crash fewer spacecraft into Mars...
So, as a public service, I am providing this handy reference page for the
Système Internationale (SI).
Metric System Base Units
These are the only base units recognized by the SI.
All other units (joules, becquerels, watts, coulombs) are derived units.
A comprehensive and handy onepage chart showing the derived units and their
relationships to the base units is available in this pdf file:
derived_units.pdf
Quantity measured 
Unit 
Abbreviation 
length 
meter 
m 
mass 
kilogram 
kg 
time 
second 
s 
electric current 
ampere 
A 
temperature 
kelvin 
K (not °K) 
luminous intensity 
candela 
cd 
amount of substance 
mole 
mol 
Note that K is for kelvin, not "degrees kelvin".
Prefixes for expressing powers
Multiplier 
Prefix 
Symbol 
10^{24}  yotta  Y 
10^{21}  zetta  Z 
10^{18}  exa  E 
10^{15}  peta  P 
10^{12}  tera  T 
10^{9}  giga  G 
10^{6}  mega  M 
10^{3}  kilo  k 
10^{2}  hecto  h 
10  deca  da 
10^{1}  deci  d 
10^{2}  centi  c 
10^{3}  milli  m 
10^{6}  micro  μ 
10^{9}  nano  n 
10^{12}  pico  p 
10^{15}  femto  f 
10^{18}  atto  a 
10^{21}  zepto  z 
10^{24}  yocto  y 
Anything greater than 10^{24} is a "lotta"
and anything less than 10^{24} is "notta".
That's a joke, son. That's a joke.
Some Handy Metrication Links
