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 SIZE | CALCULATED CIRCULAR MILS |
| #18 awg | 1623.74 |
| #16 awg | 2582.26 |
| #14 awg | 4106.63 |
| #12 awg | 6530.86 |
| #10 awg | 10,386.15 |
| #8 awg | 16,502.38 |
| #6 awg | 26,244.07 |
| #4 awg | 41,736.48 |
| #3 awg | 52,656.81 |
| #2 awg | 66,374.38 |
| #1 awg | 83,665.49 |
| #1/0 awg | 105,556.53 |
| #2/0 awg | 133,054.95 |
| #3/0 awg | 167,868.70 |
| #4/0 awg | 211,600 |
| #250 kcmil | 250,000 |
| #300 kcmil | 300,000 |
| #350 kcmil | 350,000 |
| #400 kcmil | 400,000 |
| #500 kcmil | 500,000 |
| #600 kcmil | 600,000 |
| #700 kcmil | 700,000 |
| #750 kcmil | 750,000 |
| #800 kcmil | 800,000 |
| #900 kcmil | 900,000 |
| #1000 kcmil | 1,000,000 |
| #1250 kcmil | 1,250,000 |
| #1500 kcmil | 1,500,000 |
| #1750 kcmil | 1,750,000 |
| #2000 kcmil | 2,000,000 |
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