Convert Foot to Nautical Mile
Convert feet to nautical miles instantly. 1 foot = 0.0001645788 nautical mile — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Nautical Mile to Foot converter for the reverse conversion.
Units explained
Foot
A foot is an Imperial and US customary unit of length equal to 12 inches or exactly 0.3048 meters. It is the most commonly used unit of length in everyday measurement in the United States.
The foot's origin is literally the length of a human foot, used as a measurement standard since antiquity. The English foot was standardized at various points in history; the modern international foot (0.3048 m exactly) was fixed by the 1959 International Yard and Pound Agreement.
Feet are used in the US for body height, building dimensions, room sizes, road sign clearances, aviation altitude (feet above sea level), and most everyday distance estimation. The UK uses feet informally for height despite officially being metric.
Used since antiquity; standardized to 0.3048 m exactly by the International Yard and Pound Agreement of 1959. Aviation worldwide uses feet for altitude despite metric adoption elsewhere.
Nautical Mile
A nautical mile is a unit of length equal to exactly 1,852 meters, defined as one minute of arc along any meridian of the Earth. It is the standard unit for sea and air navigation worldwide.
Originally defined as one minute of arc along a great circle of the Earth, making it convenient for celestial navigation. The International Hydrographic Organization (IHO) standardized the value at exactly 1,852 meters in 1929.
Nautical miles are used in maritime navigation, aviation, and international law (territorial waters, exclusive economic zones). Speed in nautical miles per hour is called a knot. The nautical mile is distinct from the statute (land) mile.
Defined for celestial navigation since antiquity; standardized to 1,852 m exactly by the IHO in 1929; adopted by the International Civil Aviation Organization (ICAO) for aviation use.
Foot to Nautical Mile conversion formula
The relationship between feet and nautical miles:
To convert feet to nautical miles, multiply the value in feet by 0.0001645788. To reverse, multiply nautical miles by 6076.1154855643.
How to use this converter
Type a value into the calculator. The result in nautical miles updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Nautical Mile to Foot converter for the reverse direction.
Step-by-step: convert feet to nautical miles
- Write down the value in feet (ft).
- Multiply that value by the factor 0.0001645788.
- The product is the equivalent value in nautical miles (nmi).
- To reverse, multiply the nautical mile value by 6076.1154855643.
Worked examples
Example 1 — Convert 1 ft to nmi:
1 × 0.0001645788 = 0.0001645788 nmi
Example 2 — Convert 100 ft to nmi:
100 × 0.0001645788 = 0.0164578834 nmi
Real-world example — Imperial mile arithmetic
5,280 feet equals exactly one nautical mile. American hikers tracking elevation gain in the smaller unit but trail length in the larger one use this constant every time they read a topographic map.
5280 ft × 0.0001645788 = 0.8689762419 nmi
Real-world example — Imperial yard-to-mile scale
1,760 feet equals exactly one nautical mile. American athletes and surveyors use this conversion to translate distances quoted in the smaller imperial unit into recognizable fractions of the larger geographic one.
1760 ft × 0.0001645788 = 0.2896587473 nmi
Real-world example — Metric distance scale-up
One thousand feet equals one nautical mile — the running distance for a 1K race or the standard metric kilometre-scale step. The simple thousand-fold conversion is the most-used metric distance translation.
1000 ft × 0.0001645788 = 0.1645788337 nmi
Foot to Nautical Mile conversion table
Standard reference values for converting feet to nautical miles:
| Foot [ft] | Nautical Mile [nmi] |
|---|---|
| 0.01 | 1.645788e-6 |
| 0.1 | 1.645788e-5 |
| 1 | 0.0001645788 |
| 2 | 0.0003291577 |
| 3 | 0.0004937365 |
| 4 | 0.0006583153 |
| 5 | 0.0008228942 |
| 10 | 0.0016457883 |
| 20 | 0.0032915767 |
| 30 | 0.004937365 |
| 40 | 0.0065831533 |
| 50 | 0.0082289417 |
| 100 | 0.0164578834 |
| 500 | 0.0822894168 |
| 1000 | 0.1645788337 |
Frequently asked questions
How many nautical miles is 1 foot?
How do I convert feet to nautical miles?
How do I convert nautical miles back to feet?
How many nautical miles is 100 feet?
Popular length unit conversions
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 ft = 0.0001645788 nmi) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.