# Feet to Kilometers (ft to km)

Source: https://www.unitconvertercalculator.com/length/feet-to-kilometers/

**1 ft = 0.0003048 km**

One foot equals exactly 0.0003048 kilometers. This conversion is commonly needed when expressing aircraft altitude (in feet) as a metric ground distance, or when comparing American building heights with metric geographic features. About 3,281 feet make one kilometer.

## Formula

Convert Feet to Kilometers

## Conversion Table

| Feet (ft) | Kilometers (km) |
|---|---|
| 1 ft | 0.0003048 km |
| 5 ft | 0.001524 km |
| 10 ft | 0.003048 km |
| 50 ft | 0.01524 km |
| 100 ft | 0.03048 km |
| 500 ft | 0.1524 km |
| 1000 ft | 0.3048 km |
| 3281 ft | 1.0000488 km |
| 5000 ft | 1.524 km |
| 5280 ft | 1.609344 km |
| 10000 ft | 3.048 km |
| 50000 ft | 15.24 km |
| 100000 ft | 30.48 km |

## Units

### Foot (ft)

An imperial unit of length equal to 12 inches or 0.3048 meters. Used in the US and UK for height, altitude, and construction.

### Kilometer (km)

A metric unit of length equal to 1000 meters. The standard unit for measuring road distances and geographic distances in most countries.

## Background

A commercial airplane at 35,000 feet cruises at 10.668 km altitude. Mount Everest at 29,032 feet is 8.849 km. The Willis Tower at 1,451 feet is 0.442 km. A mile (5,280 feet) is 1.609 km. This conversion bridges American altitude and height measurements with the metric kilometer used worldwide.

## Good to Know

Aviation uses feet for altitude worldwide, even in metric countries. A pilot saying 'flight level 350' means 35,000 feet (10.67 km). This is one of the most persistent non-metric conventions in international transportation.

## FAQ

### How many kilometers is 1 foot?

One foot equals exactly 0.0003048 km. For quick estimation, divide feet by 3,281 to get kilometers.

### How many feet are in 1 kilometer?

One kilometer contains approximately 3,280.84 feet. This is about 3,281 feet for practical purposes.

### How do I convert airplane altitude from feet to km?

Multiply feet by 0.0003048. For example, 35,000 feet x 0.0003048 = 10.668 km. Or divide by 3,281: 35,000 / 3,281 = 10.67 km.

## Non-Frequently Asked Questions

### How many feet is a 5K run?

A 5K (5 km) is 16,404.2 feet. That is 5,468 yards or about 54.7 football fields. Runners who think in feet would find '16,404 feet' much more intimidating than '5K.' The metric version sounds shorter. It is not.

### At what altitude do planes fly in feet vs kilometers?

Most countries use feet for aviation altitude (35,000 feet = 10.668 km). China and Russia use meters. Nobody uses kilometers for altitude. Saying 'we are cruising at 10.7 kilometers' would terrify American passengers who think in feet.

### Is Mount Everest taller in feet or kilometers?

Everest is 29,032 feet or 8.849 km. Same height, different numbers. But '29,032' sounds more impressive than '8.849' because bigger numbers feel bigger. Mountaineers use both, depending on which country's expedition they joined.

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## See Also

- [Kilometers to Feet](https://www.unitconvertercalculator.com/length/kilometers-to-feet/)