Feet to Kilometers Converter

Feet to Kilometers

Convert feet (ft) to kilometers (km). Both measure distance and dimension, and the conversion comes up in construction, navigation, sports work.

The Formula

`` kilometers = feet × 0.0003048 feet = kilometers × 3280.83989501 `

One foot is 3.0480e-4 kilometers, and one kilometer is 3,280.84 feet.

Conversion Table

Feet	Kilometers
1 ft	3.0480e-4 km
2 ft	6.0960e-4 km
5 ft	0.001524 km
10 ft	0.003048 km
25 ft	0.00762 km
50 ft	0.01524 km
100 ft	0.03048 km
500 ft	0.1524 km
1,000 ft	0.3048 km

The Other Direction

Kilometers	Feet
1 km	3,280.84 ft
2 km	6,561.68 ft
5 km	16,404.2 ft
10 km	32,808.4 ft
25 km	82,021 ft
50 km	164,041.99 ft
100 km	328,083.99 ft
500 km	1,640,419.95 ft
1,000 km	3,280,839.9 ft

What Each Unit Is

Feet (ft) — exactly 0.3048 metres, or one third of a yard. A human foot, standardised across centuries of conflicting local definitions.

Kilometers (km) — 1,000 metres. The metric system’s road-scale unit, adopted across most of the world in the 19th century.

A Sense of Scale

• A ceiling is 8–9 ft
• Aviation altitude is always in feet
• A door is about 6.7 ft
• A 20-minute walk covers about 1.5 km
• A marathon is 42.195 km
• A cruising airliner flies at 11 km

Precision

The factor 0.0003048 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

In Code

`javascript const footToKilometer = (value) => value * 0.0003048; ``

Where This Conversion Comes Up

• Construction
• Navigation
• Sports
• Sewing
• Mapping

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 ft with the factor truncated at each decimal place:

Decimals kept	Factor	137 ft becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0	0	100.0000%
4	0.0003	0.0411	1.5748%

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured feet to three significant figures, the answer in kilometers is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Feet

The same value in every other unit this converter supports for length:

From	To	Unit
1 ft	0.3048 m	Meters
1 ft	30.48 cm	Centimeters
1 ft	304.8 mm	Millimeters
1 ft	1.8939e-4 mi	Miles
1 ft	0.333333 yd	Yards
1 ft	12 in	Inches
1 ft	1.6458e-4 nmi	Nautical Miles

Chaining conversions works — feet to metres to feet gives the same answer as feet to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.