Square Miles to Square Inches: the quick answer
1 mi² = 4,014,490,000 in²
1 square mile equals 4,014,490,000 square inches
To convert square miles to square inches, multiply the value by 4,014,490,000. To go the other way, multiply square inches by 2.49098 × 10⁻¹⁰ to get square miles.