Convert Feet to Kilometers
Foot (ft) to Kilometer (km) unit conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 ft = 0.0003048 km
1 Foot = 0.0003048 Kilometers
1 Kilometer = 3280.8399 Feet
1 ft in every supported unit
Conversion chart: Foot to Kilometers
Conversion table
| Foot (ft) | Kilometer (km) |
|---|---|
| 0.01 ft | 3.048E-06 km |
| 0.1 ft | 3.048E-05 km |
| 1 ft | 0.0003048 km |
| 2 ft | 0.0006096 km |
| 3 ft | 0.0009144 km |
| 5 ft | 0.001524 km |
| 10 ft | 0.003048 km |
| 20 ft | 0.006096 km |
| 50 ft | 0.01524 km |
| 100 ft | 0.03048 km |
| 1000 ft | 0.3048 km |
Quick Reference
- a credit card's width is about 0.281 ft — that's 0.0001 km.
- a school bus is about 39.37 ft — that's 0.012 km.
- a marathon is about 138,435 ft — that's 42.2 km.
Foot (ft)
Definition: Equal to exactly 0.3048 meters, or 12 inches.
History: Derived from the length of a human foot and used since antiquity by the Egyptians, Greeks, and Romans in varying lengths. England standardized its own foot by statute over the medieval period, and the 1959 international agreement fixed it permanently to the meter.
Current use: The standard unit for building heights, elevation, and aviation altitude, and the default unit of length in US construction and real estate.
Kilometer (km)
Definition: One thousand meters (10³ m), the standard metric unit for long distances.
History: A decimal multiple of the meter introduced in the same 1790s French metric reform, chosen so that large distances could be expressed with simple round numbers instead of the thousands of yards or miles used by older systems.
Current use: Used worldwide for road signage, geographic distance, and vehicle speed (kilometers per hour) in every country except the United States.
Supported Units
| Unit | Symbol | In Meters |
|---|---|---|
| Millimeter | mm | 0.001 m |
| Centimeter | cm | 0.01 m |
| Meter | m | 1 m |
| Kilometer | km | 1000 m |
| Inch | in | 0.0254 m |
| Foot | ft | 0.3048 m |
| Yard | yd | 0.9144 m |
| Mile | mi | 1609.344 m |
| Nautical Mile | nmi | 1852 m |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Length Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the meter. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Foot → Kilometer: multiply by 0.0003048. For example, 1 ft × 0.0003048 = 0.0003048 km.
Metric vs. Imperial
The metric units on this page (millimeter through kilometer) all scale by powers of ten, so converting between them is just moving a decimal point. Imperial/US customary units (inch, foot, yard, mile) use irregular multiples — 12 inches to a foot, 3 feet to a yard, 1,760 yards to a mile — inherited from centuries of regional standards before the metric system existed.
Why Precision Matters
Length conversions look simple but small rounding errors compound over large distances or repeated calculations — this is why, for example, NASA's Mars Climate Orbiter was lost in 1999 after one team used metric units and another used imperial units without converting. Every multiplier used on this page is the exact, internationally defined conversion factor, not a rounded approximation.
Example
1 ft equals 0.0003048 km. For scale, that's about 0.18× the height of an average adult (1.7 m, or 5.5774278 ft).
Frequently Asked Questions
How many Kilometers are in 1 Foot?
1 Foot (ft) equals exactly 0.0003048 Kilometers (km).
Why does the US still use feet and miles?
The US never mandated metrication despite the Metric Conversion Act of 1975 declaring it the preferred system; adoption remained voluntary, so imperial units stayed dominant in everyday life, construction, and road signage, while science and medicine in the US use metric units almost exclusively.
What's the difference between a mile and a nautical mile?
A statute mile (1,609.344 m) is a land-distance unit; a nautical mile (1,852 m) is based on one minute of latitude and is used for sea and air navigation because it relates directly to a ship or aircraft's position on a chart.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally standardized value (e.g. 1 inch = exactly 2.54 cm, fixed by international agreement in 1959) — results are limited only by floating-point display precision, not by rounded conversion constants.