To convert circular mils to square inches, multiply the value by 7.85398 × 10⁻⁷. To go the other way, multiply square inches by 1,273,240 to get circular mils.
| Circular Mils (cmil) | Square Inches (in²) |
|---|---|
| 1 cmil | 7.85398 × 10⁻⁷ in² |
| 2 cmil | 1.5708 × 10⁻⁶ in² |
| 5 cmil | 3.92699 × 10⁻⁶ in² |
| 10 cmil | 7.85398 × 10⁻⁶ in² |
| 20 cmil | 1.5708 × 10⁻⁵ in² |
| 50 cmil | 3.92699 × 10⁻⁵ in² |
| 100 cmil | 7.85398 × 10⁻⁵ in² |
| 500 cmil | 0.000392699 in² |
| 1,000 cmil | 0.000785398 in² |
25 cmil × 7.85398 × 10⁻⁷ = 1.9635 × 10⁻⁵ in²
Try this example →250 cmil × 7.85398 × 10⁻⁷ = 0.00019635 in²
Try this example →Circular mil (cmil). A circular mil is the area of a circle 0.001 inch across, the standard measure of wire cross-section in American Wire Gauge.
Square inch (in²). A square inch is the area of a square with 1-inch sides (6.4516 cm²).
There are 7.85398 × 10⁻⁷ square inches in one circular mil.
Multiply the number of circular mils by 7.85398 × 10⁻⁷. For example, 10 circular mils equal 7.85398 × 10⁻⁶ square inches.
One square inch equals 1,273,240 circular mils.