Code  Prefix  Power of 10 Linear 
Power of 10 Square 
Power of 10 Cubic 
Equlivalent Part/Fold 

Googol  100  200  300  10^{100}, Googolfold  
Y  Yotta  24  48  72  10^{24}, Septillionfold 
Z  Zetta  21  42  63  10^{21}, Sextillionfold 
E  Exa  18  36  54  10^{18}, Quintillionfold 
P  Petra  15  30  45  10^{15}, Quadrillionfold 
T  Tera  12  24  36  10^{12}, Trillionfold 
G  Giga  9  18  27  1,000,000,000; Billionfold 
M  Mega  6  12  18  1,000,000; Millionfold 
Myria  4  8  12  10,000, Ten Thousandfold  
k  Kilo  3  6  9  1000, Thousandfold 
h  Hecto  2  4  6  100, Hundredfold 
da  Deca  1  2  3  10, Tenfold 
Nona  9, Ninefold  
Octa  8, Eightfold  
Septa  7, Sevenfold  
Hexa  6, Sixfold  
Quinte  5, Fivefold  
Quadri  4, Fourfold  
Tri  3, Threefold  
Bi  2, Twofold  
Uni  1, whole  
Semi  1/2, half part  
Tetarto  1/4, fourth part  
d  Deci  1  2  3  1/10, tenth part 
c  Centi  2  4  6  1/100, hundredth part 
m  Milli  3  6  9  1/1000, thousandth part 
u  Micro  6  12  18  10^{6}, millionth part 
n  Nano  9  18  27  10^{9}, billionth part 
p  Pico  12  24  36  10^{12}, trillionth part 
f  Femto  15  30  45  10^{15}, quadrillionth part 
a  Atto  18  36  54  10^{18}, quintillionth part 
z  Zepto  21  42  63  10^{21}, sextillionth part 
y  Yocto  24  48  72  10^{24}, septillionth part 
To convert from prefixedunit to basic unit, multiply by 10 to its power (reverse of above, multiply by 10 to the 3rd power or 10^{3}to return to meters.
To go from one prefix to another (Mega to kilo), multiply by the difference of powers of 10 (former minus latter power of 10).
Mega = 10^{6}, kilo = 10^{3}, difference is 10^{3} (use that figure to multiply with)
Centi = 10^{2}, kilo = 10^{3}, difference is 10^{5} (multiply using this figure)
All units are converted to basic or common units before conversion takes place.

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