BCBetter Calculators

Feet to Kilometers Calculator

Convert feet to kilometers instantly.

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Enter your values and click Calculate

How It Works

Kilometers = Feet × 0.0003048. The factor is derived in two steps: one foot equals exactly 0.3048 meters by international definition (established in 1959), and one kilometer equals exactly 1,000 meters by SI definition. Dividing 0.3048 by 1,000 yields the exact feet-to-kilometers factor of 0.0003048. Because both source definitions are exact integers or defined decimals, the conversion carries no approximation error — any rounding in the output is only for display purposes. For large altitude values such as airplane cruising altitudes around 35,000 feet, the result (roughly 10.67 km) aligns with the commonly quoted metric equivalent. The calculator returns six decimal places so that short measurements still display a meaningful result rather than collapsing to zero.

Examples

Mile in Feet
Converting 5280 feet (1 mile) to kilometers.
Result: 5,280 ft equals approximately 1.609344 km.
Cruising Altitude
Converting 35,000 ft airplane cruising altitude to kilometers.
Result: 35,000 ft equals approximately 10.668 km.
Mount Everest
Converting the summit height of 29,032 feet to kilometers.
Result: 29,032 ft equals approximately 8.849 km.

Frequently Asked Questions

How many kilometers are in a foot?
One foot equals exactly 0.0003048 kilometers. This is an exact value derived from the international definition of the foot as exactly 0.3048 meters divided by 1,000.
Is this useful for aviation altitude conversion?
Yes. Aviation altitudes are universally expressed in feet — for example, commercial jets cruise around 35,000 feet, which equals about 10.67 km. Meteorology and international weather reports often use kilometers for the same altitudes.
How does feet to kilometers differ from feet to meters?
The conversion factor for feet to meters is 0.3048, while for feet to kilometers it is 0.0003048 — exactly 1,000 times smaller. Use meters for everyday distances and kilometers for longer geographic or aviation measurements.

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