SI Unit Prefixes

Prefix   Symbol Factor Decimal
Yocto Septillionth y 10-24   0.000000000000000000000001
Zepto Sextillionth z 10-21   0.000000000000000000001
Atto Quintillionth a 10-18   0.000000000000000001
Femto Quadrillionth 10-15   0.000000000000001
Pico Trillionth 10-12   0.000000000001
Nano Billionth 10-9   0.000000001
Micro  Millionth µ  10-6   0.000001
Milli Thousandth 10-3   0.001
Centi Hundredth c 10-2   0.01
Deci  Tenth 10-1   0.1
  One   100 1
Deca  Ten da  101 10  
Hecto Hundred 102 100  
Kilo Thousand 103 1000  
Mega Million 106 1000000  
Giga Billion 109 1000000000  
Tera Trillion 1012 1000000000000  
Peta Quadrillion 1015 1000000000000000  
Exa Quintillion 1018 1000000000000000000  
Zetta Sextillion 1021 1000000000000000000000  
Yotta Septillion 1024 1000000000000000000000000   
 
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