How to Convert Feet to Kilometres (ft to km)
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles. This guide shows how to convert feet into kilometres by hand, with examples and a quick-reference table.
The conversion
To convert feet to kilometres, multiply the value by 0.0003048. To go the other way, divide by the same number (or multiply by 3,280.8398950131). Because the factor is tiny, scientific notation keeps the numbers manageable.
Kilometres = feet × 0.0003048
Worked examples
- 3 ft = 0.000914 km
- 12.5 ft = 0.00381 km
- 75 ft = 0.02286 km
Feet to Kilometres table
| Feet | Kilometres |
|---|---|
| 1 ft | 0.000305 km |
| 2 ft | 0.00061 km |
| 5 ft | 0.001524 km |
| 10 ft | 0.003048 km |
| 20 ft | 0.006096 km |
| 25 ft | 0.00762 km |
| 50 ft | 0.01524 km |
| 100 ft | 0.03048 km |
| 250 ft | 0.0762 km |
| 500 ft | 0.1524 km |
| 1,000 ft | 0.3048 km |
Common questions
Is ft to km exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilometres to Feet converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Feet to Kilometres Converter or browse all length converters.
Run your own numbers: Feet to Kilometres Converter