How to convert nautical miles to kilometers
Formula: km = nmi × 1.852. Worked example: 10 nmi = 18.52 km. Quick estimate: multiply by about 1.9 — the error is 2.6%, fine for everyday use but not for engineering or shopping by exact size.
About these units
The nautical mile is exactly 1,852 m, historically one minute of latitude. It is used in marine and air navigation, and one nautical mile per hour is a knot. Territorial waters extend 12 nautical miles (22.224 km).
Category: length. Results on this page are calculated in your browser and rounded to 7 significant digits; the table above uses 6. For other units of length open the full unit converter, or use the reverse page — kilometers to nautical miles.