Square Inches to Square Nautical Miles: the quick answer
1 in² = 1.88099 × 10⁻¹⁰ NM²
1 square inch equals 1.88099 × 10⁻¹⁰ square nautical miles
To convert square inches to square nautical miles, multiply the value by 1.88099 × 10⁻¹⁰. To go the other way, multiply square nautical miles by 5,316,360,000 to get square inches.