Convert nautical miles to miles (nmi to mi)

One nautical mile is 1.150779448 statute miles: exactly 1,852 meters over exactly 1,609.344. Both definitions are exact, so the ratio is too, without being round.

Worked through: 50 nmi x 1.15077945 = 57.539 mi.

Going the other way, one mile is 0.8689762419 nautical miles.

For mental arithmetic: Add 15%. 100 nautical miles is 115 statute miles.

The direction for reading a maritime or aviation figure in land terms. The 12-nautical-mile territorial sea is 13.8 statute miles, and the 200-nautical-mile exclusive economic zone is about 230. Aircraft ranges are published in nautical miles, so a jet rated for 3,000 nmi can fly 3,452 statute miles. Speed follows the same factor: a knot is one nautical mile per hour, so a ship at 20 knots is doing 23 mph, and a speed in knots that is read as mph understates it by 13%.

Precision is worth matching to the input. A measurement given as 1 nmi carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.