ConverterHub

Nautical Miles to Miles Converter

Enter nautical miles to convert to statute miles and kilometres.

How it is calculated

Two multiplications from the same input: statute miles = NM × 1.1507794 and km = NM × 1.852. NM is the distance in international nautical miles, defined as exactly 1,852 metres. The factor 1.1507794 is the ratio of 1,852 m to the 1,609.344 m of an international statute (land) mile. Both results are rounded to two decimals for display. The tool converts in one direction only, from nautical miles to miles and kilometres; to go back, divide miles by 1.1507794 or kilometres by 1.852. It does not stop you entering zero or a negative number, which simply produces zero or a negative distance.

Worked example

A passage of 12 nautical miles. Step 1: statute miles = 12 × 1.1507794 = 13.8093, shown as 13.81 mi. Step 2: kilometres = 12 × 1.852 = 22.224, shown as 22.22 km. As a check, 22.224 km ÷ 1.609344 km per mile gives the same 13.81 statute miles. The statute-mile figure is larger than 12 because each statute mile is shorter than a nautical mile.

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Common mistakes

  • Treating nautical and statute miles as the same. A nautical mile is about 15% longer, so 100 NM is roughly 115 statute miles.
  • Converting a speed in knots as a distance. Knots are nautical miles per hour; multiply by the hours travelled to get distance before converting.
  • Typing statute miles into the field. It only accepts nautical miles, so a land-mile figure entered here comes out about 15% too large.
  • Rounding the factor to 1.15 for long routes. Over thousands of miles a rounded factor drifts noticeably.
  • Using this for the old UK Admiralty mile or any non-international definition; the tool uses the international 1,852 m mile.

About this calculator

A nautical mile is defined as exactly 1.852 kilometres (an international standard adopted in 1929), which converts to about 1.15078 statute miles — the "regular" mile used on land. The nautical mile isn't an arbitrary round number: it was originally defined as the length of one minute of arc along a meridian of the Earth, which is why it ties so directly to latitude and to speed measured in knots (nautical miles per hour).

Mariners and pilots navigate almost exclusively in nautical miles and knots because of that link to latitude — one degree of latitude is always 60 nautical miles, making chart plotting and dead-reckoning straightforward — so converting to statute miles or kilometres is mainly needed when communicating distances or speeds to a land-based, non-nautical audience.

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