Square Mils to Square Inches: the quick answer
1 mil² = 1 × 10⁻⁶ in²
1 square mil equals 1 × 10⁻⁶ square inches
To convert square mils to square inches, multiply the value by 1 × 10⁻⁶. To go the other way, multiply square inches by 1,000,000 to get square mils.