Convert Feet to Nautical Miles

The Foot (symbol: ft) is a unit of length & distance. An imperial unit of length equal to exactly 12 inches = 0.3048 meters per the 1959 International Yard and Pound Agreement. The foot is the most-used imperial length unit in daily life: US construction blueprints and architectural plans (residential / commercial / civil per AIA, IBC, ASCE 7), US real estate listings (square footage, lot frontage), US surveying (the US Survey Foot used in legacy land records is 1200/3937 m ≈ 0.30480061 m, very slightly different from the International Foot; NIST formally retired the US Survey Foot on January 1, 2023), and everyday height measurement in the US and UK ('5 foot 10'). The foot is also the global International Civil Aviation Organization (ICAO) standard for altitude — flight levels and altimeter readings are quoted in hundreds or thousands of feet worldwide regardless of the country's everyday measurement system. Reference values: standard residential ceiling 8 ft; typical US ranch-house lot 50-75 ft frontage; basketball hoop 10 ft; commercial flight cruise altitude 32,000-42,000 ft; Mount Everest 29,032 ft. A foot divides into 12 inches and three feet make a yard, reflecting the base-12 heritage of English measurement.

It belongs to the imperial measurement system.

Feet are commonly used in construction, navigation, athletics, and everyday measurement.

The Nautical Mile (symbol: nmi) is a unit of length & distance. A unit of length used in maritime and air navigation, equal to exactly 1,852 meters (≈ 1.151 statute miles) per the 1929 International Hydrographic Bureau extraordinary conference definition (formally adopted by the US in 1954 and the UK in 1970). The nautical mile was originally defined to equal exactly one minute of arc of latitude along any meridian, making it uniquely useful for chart plotting — one degree of latitude is 60 nautical miles anywhere on Earth, so latitude scales on navigation charts double as direct distance references. The minute-of-arc definition produces ~1,855 m at the equator and ~1,861 m at the poles due to Earth's oblateness, so the 1929 conference fixed the international nautical mile at 1,852 m exactly. International maritime shipping (IMO regulations), commercial aviation (ICAO standards, FAA flight plans, ATC distance clearances), military naval operations, and maritime speed measurement (knots = nautical miles per hour, used universally on ships and aircraft) all use nautical miles as their native unit because the math of navigation — great-circle distance, course plotting, ETA calculation — is dramatically simpler than with statute miles. Convert nmi to km by multiplying by 1.852; to statute miles by multiplying by 1.151.

It belongs to the imperial measurement system.

Nautical Miles are commonly used in construction, navigation, athletics, and everyday measurement.