Foot to Kilometre Converter
Convert feet to km instantly. Free feet to km calculator with formula, examples and FAQs.
Quick answer
1 feet equals 3.048e-4 km. To convert feet to km, multiply the feet value by 3.048e-4 — so 10 feet = 0.003048 km. This factor is exact, and the reverse conversion (km to feet) simply divides by 3.048e-4 instead of multiplying.
Converted value
0.00
1.00 feet = 0.00 km
What is feet to km?
feet to km is a length conversion: the measured amount does not change, just the way it is expressed. It matters most to US users, pilots and anyone filling metric forms. A single conversion factor (km = feet × 0.00030480000000000004) handles any value, large or small.
Real-world uses: why convert feet to km?
Converting feet to km bridges two ways of measuring the same thing. People do it most often when reading aviation altitude given in feet, and on the receiving side when logging running and cycling distances from a GPS watch. Having the exact value — not a rough estimate — prevents costly mistakes in paperwork, purchases and planning.
- •Converting US property and ceiling heights to metric.
- •Reading aviation altitude given in feet.
- •Checking furniture and appliance clearances.
- •Understanding height in metric for forms and IDs.
- •Logging running and cycling distances from a GPS watch.
Who uses this conversion?
How the feet to km conversion is calculated
This is the same arithmetic that calculators and search engines use — no rounded shortcuts.
km = feet × 0.00030480000000000004
- Both feet and km are defined in terms of the same base unit, the metre.
- 1 feet = 0.3048 metre, and 1 km = 1000 metre.
- Divide one definition by the other to get the conversion factor: 0.3048 ÷ 1000 = 0.0003048.
- So km = feet × 0.00030480000000000004. Multiply any feet value by 0.0003048 to get the result in km.
Precision: The conversion factor is exact by international definition, so the result is an exact rational number. We display it rounded to four decimal places (or four significant figures for very small values).
Example calculations
- •1 feet = 0.0003048 km
- •6 feet = 0.001829 km
- •10 feet = 0.003048 km
feet to km quick reference table
Common feet values converted to km, each calculated with the exact factor.
| feet | km |
|---|---|
| 10 | 0.003048 |
| 25 | 0.00762 |
| 50 | 0.0152 |
| 100 | 0.0305 |
| 250 | 0.0762 |
| 500 | 0.1524 |
| 1000 | 0.3048 |
| 2500 | 0.762 |
| 5000 | 1.524 |
| 10000 | 3.048 |
Common mistakes to avoid
- •Reading the result the wrong way round. Confirm the answer is in km, not feet, before you rely on it.
- •Truncating instead of rounding, which compounds error across larger feet values.
- •Mixing metric and imperial units midway through a multi-step conversion instead of converting to a single base unit first.
Common questions about length conversions
Is this length conversion exact?
Yes. Factors such as 1 inch = 25.4 mm and 1 mile = 1,609.344 m are exact by international agreement, so the only rounding is in how many decimals we display.
Why do my results differ slightly from another tool?
Almost always because the other tool rounds the factor (e.g. 0.62 instead of 0.621371) or rounds partway through. We keep full precision and round only the final value.
Metric or imperial — which should I use?
Use metric (m, cm, km) for science and most countries, and imperial (ft, in, miles) for US and UK everyday distances. This page bridges the two exactly.
Can I round the answer?
Yes. For everyday use one or two decimals is plenty; engineering and science may need more. Round only at the end to avoid cumulative error.
History of these units
History of the foot
imperial / US customary
The foot has roots in the length of a human foot and varied widely before standardisation. The international foot is now exactly 0.3048 metres and stays common in US construction and aviation altitude.
History of the kilometre
metric
The kilometre arrived with the metric system in 1790s France as 1,000 metres, the metre itself first defined as one ten-millionth of the distance from the equator to the North Pole. It is now the standard unit for road distance across most of the world.
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Frequently asked questions
How do I convert feet to km?
What is 1 feet in km?
How do I convert km back to feet?
When would I need to convert feet to km?
Is the feet to km factor exact?
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