The US survey foot is 1200/3937 meters and is retained for legacy land records.
US survey feet to Nautical miles Converter — ftUS to nmi
Convert US survey foot (ftUS) to Nautical mile (nmi) using the exact conversion factor (1 us survey foot = 0.0001645792 nautical mile). See the formula, worked examples, conversion table, history, and common uses.
US survey feet to Nautical miles converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
A nautical mile is exactly 1,852 meters.
Result = input x 0.3048006096 / 1852.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting US survey feet to Nautical miles
US survey foot and Nautical mile both measure length. Specifically: The US survey foot is 1200/3937 meters and is retained for legacy land records, and a nautical mile is exactly 1,852 meters.
Formula
nautical miles = us survey feet × 0.000164579162852
This factor comes from each unit's defined relationship to the category's base unit: 1 us survey foot equals 0.304800609601 base units, and 1 nautical mile equals 1852 base units, so dividing one by the other gives the direct us survey foot-to-nautical mile factor of 0.000164579162852.
Simple example
1 ftUS × 0.0001645791629 = 0.0001645792 nmi
1 us survey foot = 0.0001645792 nautical miles.
Real-world example
10 ftUS × 0.0001645791629 = 0.0016457916 nmi
10 us survey feet = 0.0016457916 nautical miles.
Conversion table
| US survey foot (ftUS) | Nautical mile (nmi) |
|---|---|
| 1 ftUS | 0.0001645792 nmi |
| 5 ftUS | 0.0008228958 nmi |
| 10 ftUS | 0.0016457916 nmi |
| 21.0975 ftUS | 0.0034722089 nmi |
| 42.195 ftUS | 0.0069444178 nmi |
| 100 ftUS | 0.0164579163 nmi |
Reverse conversion: Nautical mile to US survey foot
0.0001645792 nmi × 6076.103333 = 1.000000226 ftUS
0.0001645792 nautical miles = 1.000000226 us survey feet.
us survey feet = nautical miles × 6076.10333333
For a page dedicated to this direction, see Nautical mile to US survey foot.
Understanding the US survey foot (ftUS)
The US survey foot is 1200/3937 meters and is retained for legacy land records.
Understanding the Nautical mile
Nautical mile (nmi) measures distance. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Where it's used: Used internationally in maritime navigation and aviation.
Uses of the Nautical mile today
- Marine and aviation distance and navigation
- Basis for the knot (nautical miles per hour)
History of the Nautical mile
The nautical mile was historically defined as one minute of latitude along a meridian, directly tying sea navigation to the Earth's geometry, which made it practical for chart-based navigation using a ship's known latitude. The International Hydrographic Bureau standardized it at exactly 1,852 meters in 1929, a value close to the traditional latitude-based definitions used by different countries.
Historical origin. Nautical mile was not the invention of a single named person; it developed through the process described above.
Nautical mile — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the nautical mile among accepted non-SI units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nautical miles are in 1 us survey foot?
1 us survey foot equals 0.0001645792 nautical miles, using the exact defined conversion factor rather than an estimate.
How do I convert us survey foot to nautical mile?
Multiply the us survey foot value by 0.0001645791629. The converter above does this instantly to whatever precision you set.
How do I convert nautical mile back to us survey foot?
Use the reverse factor: 1 nautical mile equals 6,076.103333 us survey feet. You can also use the swap control in the converter above to flip the direction instantly.
What is a us survey foot?
US survey foot (ftUS) is a unit of length.
What is a nautical mile?
Nautical mile (nmi) measures distance. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Is the us survey foot to nautical mile conversion exact?
Yes. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.