Convert Square Miles to Circular Mils
Convert Square Miles (mi²) to Circular Mils (cmil) instantly and accurately.
Conversion Formula
cmil = mi² × 5.111406911e+15
About Square Miles
A square mile (mi²) is an imperial unit of area equal to a square with sides of one mile (5,280 ft × 5,280 ft). It is used for measuring large land areas like counties, states, and countries in the United States. Los Angeles covers about 503 mi², Rhode Island (smallest US state) is roughly 1,214 mi², and Alaska is about 665,384 mi². This unit is standard in American geography, land surveying, and regional planning.
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.
Quick Reference Table
| Square Miles (mi²) | Circular Mils (cmil) |
|---|---|
| 1 mi² | 5.111 × 1015 cmil |
| 2 mi² | 1.022 × 1016 cmil |
| 5 mi² | 2.556 × 1016 cmil |
| 10 mi² | 5.111 × 1016 cmil |
| 25 mi² | 1.278 × 1017 cmil |
| 50 mi² | 2.556 × 1017 cmil |
| 100 mi² | 5.111 × 1017 cmil |