Convert Foot to Kilometer
Convert feet to kilometers instantly. 1 foot = 0.0003048 kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilometer 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.
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.
Foot to Kilometer conversion formula
The relationship between feet and kilometers:
To convert feet to kilometers, multiply the value in feet by 0.0003048. To reverse, multiply kilometers by 3280.8398950131.
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 Foot converter for the reverse direction.
Step-by-step: convert feet to kilometers
- Write down the value in feet (ft).
- Multiply that value by the factor 0.0003048.
- The product is the equivalent value in kilometers (km).
- To reverse, multiply the kilometer value by 3280.8398950131.
Worked examples
Example 1 — Convert 1 ft to km:
1 × 0.0003048 = 0.0003048 km
Example 2 — Convert 100 ft to km:
100 × 0.0003048 = 0.03048 km
Real-world example — Aviation altitude to kilometres
A 10,000-foot cruising altitude equals 3.048 km. Pilots and air-traffic controllers worldwide use feet for vertical separation but cite distance to the next airport in kilometres; the conversion is part of every flight plan.
10000 ft × 0.0003048 = 3.048 km
Real-world example — Mountaineering elevation
A 5,000-foot peak equals 1.524 km. Climbing-route description websites cite peak heights in feet (US convention) but topographic maps in metric countries reference kilometres.
5000 ft × 0.0003048 = 1.524 km
Real-world example — Tall-building heights
A 1,000-foot skyscraper equals 0.305 km. Real-estate marketing in different countries swaps between feet (US) and kilometres or metres for the same tower; the conversion is part of every cross-border architectural comparison.
1000 ft × 0.0003048 = 0.3048 km
Foot to Kilometer conversion table
Standard reference values for converting feet to kilometers:
| Foot [ft] | Kilometer [km] |
|---|---|
| 0.01 | 3.048e-6 |
| 0.1 | 3.048e-5 |
| 1 | 0.0003048 |
| 2 | 0.0006096 |
| 3 | 0.0009144 |
| 4 | 0.0012192 |
| 5 | 0.001524 |
| 10 | 0.003048 |
| 20 | 0.006096 |
| 30 | 0.009144 |
| 40 | 0.012192 |
| 50 | 0.01524 |
| 100 | 0.03048 |
| 500 | 0.1524 |
| 1000 | 0.3048 |
Frequently asked questions
How many kilometers is 1 foot?
How do I convert feet to kilometers?
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Popular length unit conversions
Convert Foot to other length units
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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 = 0.0003048 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.