Miles to Nautical Miles Converter
Enter a value to instantly convert between length units.
1 Mile = 0.869 Nautical Mile
Key Formulas
Centimeter → Inch
in = cm × 0.393701Kilometer → Mile
mi = km × 0.621371Foot → Meter
m = ft × 0.3048Inch → Centimeter
cm = in × 2.54Formula
nmi = mi × 0.868976Consumer GPS units and road signage report distance in statute miles, but flight plans, marine charts, and air traffic control all work in nautical miles. Anyone bridging the two, a boater checking a GPS-reported distance against a paper chart, or a pilot cross-referencing airport data, needs this conversion.
Source: NIST SP 811, Table B.8
Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
A boater's handheld GPS shows 100 miles to the next marina. Converted to 86.9 nautical miles, that matches the distance marked on the paper nautical chart.
100 mi = 86.9 nmi
Air traffic control requires 3 statute miles of separation in some airspace; a pilot converts that to 2.6 nautical miles to cross-check against onboard instruments calibrated in nautical units.
3 mi = 2.6069 nmi
A sailing race course is described as 25 miles by the event's public website; competitors convert to 21.7 nautical miles to plan fuel and time using standard marine navigation math.
25 mi = 21.72 nmi
A private pilot's road-trip-style range estimate of 500 miles becomes 434.5 nautical miles when entered into flight-planning software.
500 mi = 434.49 nmi