Convert Circular Mils to Square Feet
Convert Circular Mils (cmil) to Square Feet (ft²) instantly and accurately.
Conversion Formula
ft² = cmil × 5.454153912e-9
About Circular Mils
A circular mil (cmil) is a unit used in electrical engineering to specify the cross-sectional area of round wires and cables. Equal to the area of a circle with a diameter of exactly one thou (one thousandth of an inch) - approximately 5.067 × 10⁻¹⁰ m² - it simplifies wire calculations: the cross-sectional area in cmil equals the wire diameter in mils, squared. US electrical codes (NEC/NEMA) specify conductor sizes in circular mils, and large cables are rated in thousands of circular mils (kcmil or MCM). A 12 AWG wire, common in US household wiring, has a cross-section of 6,530 cmil.
About Square Feet
A square foot (ft²) is an imperial unit of area equal to a square with sides of one foot (12 in × 12 in or 144 in²). It is the standard for measuring floor space in the United States and some other countries. A typical bedroom is 100-150 ft², and the average American house is roughly 2,000-2,500 ft². This unit dominates real estate listings, flooring sales, and construction in countries using imperial measurements.
Quick Reference Table
| Circular Mils (cmil) | Square Feet (ft²) |
|---|---|
| 1 cmil | 5.454 × 10-9 ft² |
| 2 cmil | 1.091 × 10-8 ft² |
| 5 cmil | 2.727 × 10-8 ft² |
| 10 cmil | 5.454 × 10-8 ft² |
| 25 cmil | 1.364 × 10-7 ft² |
| 50 cmil | 2.727 × 10-7 ft² |
| 100 cmil | 5.454 × 10-7 ft² |