Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Feet to Kilometres
Convert ft to km instantly, then review the formula, assumptions, and rounding guidance.
Length & distanceInstant result
Decimals
Formula result = input × 0.3048 ÷ 1000. 1 ft = 0.0003 km
Common examples
One value, several units
Metres0.3048 m
Kilometres0.0003 km
Centimetres30.48 cm
Millimetres304.8 mm
Miles0.0002 mi
Yards0.3333 yd
Inches12 in
Nautical miles0.0002 nmi
Conversion table
| ft | km |
|---|---|
| 1 ft | 0.0003 km |
| 2 ft | 0.0006 km |
| 5 ft | 0.0015 km |
| 10 ft | 0.003 km |
| 25 ft | 0.0076 km |
| 50 ft | 0.0152 km |
| 100 ft | 0.0305 km |
Conversion chart
1 ft0.0003 km
5 ft0.0015 km
10 ft0.003 km
25 ft0.0076 km
50 ft0.0152 km
Worked example
1 metre equals 3.28084 feet.
Unit definition
Feet (ft) One feet equals 0.3048 metre.
Unit history
The international foot was standardized in 1959 as exactly 0.3048 metre.
Step by step
1. Parse the value, including fractions.
2. Convert ft to metre.
3. Convert the base value to km and apply your display precision.
Understand the result before using it
Feet to Kilometres converts a value measured in Feet (ft) into the equivalent value in Kilometres (km). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.3048 ÷ 1000
Assumptions
- Feet and Kilometres represent the same length & distance quantity.
- The input is expressed in ft; the output is expressed in km.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 ft = 0.0003048 km. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a ft measurement in a document that expects km.
- Compare a feet value with a value reported in kilometres.
- Check the ft-to-km arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse ft with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Feet to Kilometres?
result = input × 0.3048 ÷ 1000 Using the displayed relationship, 1 ft equals 0.0003048 km.
How many Kilometres are in one Feet?
One Feet is 0.0003048 Kilometres. The displayed digits may be rounded.
Can I reverse the ft to km conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts km back to ft.
Is the Feet to Kilometres result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.