Circular Mils

 

In electrical engineering, a circular mil is a unit that defines the area of a wire's cross section. One mil equals one thousandth of an inch. This measurement is very commonly used to select the proper wire size based on the amperage of power supply. Listed below is a chart showing the circular mils in the comonly used, code-required wire sizes:

  Overcurrent Protection for  
   Circular Mils   

WIRE  SIZECALCULATED  CIRCULAR  MILS
#18 awg1623.74
#16 awg2582.26
#14 awg4106.63
#12 awg6530.86
#10 awg10,386.15
#8 awg16,502.38
#6 awg26,244.07
#4 awg41,736.48
#3 awg52,656.81
#2 awg66,374.38
#1 awg83,665.49
#1/0 awg105,556.53
#2/0 awg133,054.95
#3/0 awg167,868.70
#4/0 awg211,600
#250 kcmil250,000
#300 kcmil300,000
#350 kcmil350,000
#400 kcmil400,000
#500 kcmil500,000
#600 kcmil600,000
#700 kcmil700,000
#750 kcmil750,000
#800 kcmil800,000
#900 kcmil900,000
#1000 kcmil1,000,000
#1250 kcmil1,250,000
#1500 kcmil1,500,000
#1750 kcmil1,750,000
#2000 kcmil2,000,000

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