Convert US Survey Foot to Kilometer
Convert us survey feet to kilometers instantly. 1 us survey foot = 0.0003048006 kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilometer to US Survey Foot converter for the reverse conversion.
Units explained
US Survey Foot
The US Survey Foot is a legacy unit of length defined as exactly 1200/3937 meters (approximately 0.3048006 m). It differs from the modern international foot by about 2 parts per million.
Established in the United States by the Mendenhall Order of 1893, which defined the foot in terms of the meter as 1200/3937 m. The US continued using this value for surveying even after the 1959 International Yard and Pound Agreement standardized the international foot at exactly 0.3048 m.
Used in US land surveying, geodetic measurements, state plane coordinate systems, and legal land descriptions. The US Survey Foot was officially deprecated by NIST and NOAA effective December 31, 2022, with the international foot becoming the sole US standard. Legacy data and recorded land surveys still reference it.
Mendenhall Order of 1893 defined the foot as 1200/3937 m; persisted in US surveying after 1959; officially deprecated by NIST/NOAA as of December 31, 2022.
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
US Survey Foot to Kilometer conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between us survey feet and kilometers:
To convert us survey feet to kilometers, multiply the value in us survey feet by 0.0003048006. To reverse, multiply kilometers by 3280.8333333333.
How to use this converter
Type a value into the calculator. The result in kilometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kilometer to US Survey Foot converter for the reverse direction.
Step-by-step: convert us survey feet to kilometers
- Write down the value in us survey feet (sft).
- Multiply that value by the factor 0.0003048006.
- The product is the equivalent value in kilometers (km).
- To reverse, multiply the kilometer value by 3280.8333333333.
Worked examples
Example 1 — Convert 1 sft to km:
1 × 0.0003048006 = 0.0003048006 km
Example 2 — Convert 100 sft to km:
100 × 0.0003048006 = 0.030480061 km
Real-world example — Imperial yard-to-mile scale
1,760 us survey feet equals exactly one kilometer. 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 sft × 0.0003048006 = 0.5364490729 km
Real-world example — Metric distance scale-up
One thousand us survey feet equals one kilometer — 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 sft × 0.0003048006 = 0.3048006096 km
Real-world example — Imperial mile arithmetic
5,280 us survey feet equals exactly one kilometer. 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 sft × 0.0003048006 = 1.6093472187 km
US Survey Foot to Kilometer conversion table
Standard reference values for converting us survey feet to kilometers:
| US Survey Foot [sft] | Kilometer [km] |
|---|---|
| 0.01 | 3.048006e-6 |
| 0.1 | 3.048006e-5 |
| 1 | 0.0003048006 |
| 2 | 0.0006096012 |
| 3 | 0.0009144018 |
| 4 | 0.0012192024 |
| 5 | 0.001524003 |
| 10 | 0.0030480061 |
| 20 | 0.0060960122 |
| 30 | 0.0091440183 |
| 40 | 0.0121920244 |
| 50 | 0.0152400305 |
| 100 | 0.030480061 |
| 500 | 0.1524003048 |
| 1000 | 0.3048006096 |
Frequently asked questions
How many kilometers is 1 us survey foot?
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How many kilometers is 100 us survey feet?
Popular length unit conversions
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 sft = 0.0003048006 km) 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.