ArchSupply Utilities

Feet to Kilometer Converter

Instant, two-way conversion across common engineering units.

Free

1 ft = 0.0003048 km(Foot → Kilometre)

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Converting feet to kilometers

To convert feet to kilometers, multiply the value by 0.0003048. Length values feed directly into setting out, spans and drawing dimensions, so the converter keeps full decimal precision in both directions.

Visual scale

To scale
1 foot = 0.0003048 kilometers.≈ 305 millionths of a kilometer
1 kilometer = 3,280.8399 feet.≈ 3.281K feet

Feet (ft)

The foot (ft) equals 12 inches and is the main building unit in US practice.

Origin
An old body-based unit standardized in 1959 as exactly 0.3048 m across English-speaking countries.
Where it is used
Used for floor-to-floor heights, spans, room sizes and setting out on US and partly UK construction projects.
Relation to SI
1 ft = 0.3048 m exactly.

Kilometer (km)

The kilometer (km) equals one thousand meters and measures geographic distance.

Origin
A decimal multiple of the SI meter.
Where it is used
Used for infrastructure alignment, transport planning, site context and mapping distances.
Relation to SI
1 km = 1,000 m exactly.

Frequently asked questions

How many kilometers are in one foot?

1 ft equals 0.0003048 km.

How do I convert feet to kilometers?

Multiply the value by 0.0003048. For example, 10 ft equals 0.003048 km.

How do I convert back from kilometers to feet?

1 km equals 3,280.8399 ft. The converter above works in both directions, so you can type into either field.

Should I work in millimeters or meters on drawings?

Most architectural and structural drawings outside the US are dimensioned in millimeters to avoid decimal points, while site levels, grids and areas are stated in meters.

Are the imperial values here exact?

Yes. The inch has been defined as exactly 25.4 mm since 1959, so foot, yard and mile conversions are exact rather than rounded.

Is this length converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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