# Feet to Astronomical Units (ft to au)

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

**1 ft = 2.0374621548674E-12 au**

One foot equals approximately 2.037 x 10-12 astronomical units. A 6-foot person stands at about 1.22 x 10-11 AU. The foot measures personal heights and room sizes; the AU measures the Earth-Sun distance. These scales are separated by about 12 orders of magnitude.

## Formula

Convert Feet to Astronomical Units

## Conversion Table

| Feet (ft) | Astronomical Units (au) |
|---|---|
| 1000000000000 ft | 2.0374621548674 au |
| 2000000000000 ft | 4.0749243097348 au |
| 5000000000000 ft | 10.187310774337 au |
| 10000000000000 ft | 20.374621548674 au |
| 25000000000000 ft | 50.936553871686 au |
| 50000000000000 ft | 101.87310774337 au |
| 100000000000000 ft | 203.74621548674 au |
| 500000000000000 ft | 1018.7310774337 au |
| 1000000000000000 ft | 2037.4621548674 au |

## 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.

### Astronomical Unit (au)

Exactly 149,597,870,700 meters by IAU 2012 definition. Roughly the average distance from the Earth to the Sun. Used for distances within our solar system.

## Background

The Earth-Sun distance (1 AU) is about 4.908 x 1011 feet (491 billion feet). Mount Everest at 29,032 feet is only 0.0000000592 AU high. A commercial airplane at 35,000 feet cruises at 0.0000000713 AU. These comparisons show how small even the tallest objects on Earth are at the AU scale.

## Good to Know

American aviation uses feet exclusively for altitude. Space science uses AU for solar system distances. The boundary between 'feet world' and 'AU world' is roughly the edge of Earth's atmosphere, about 328,000 feet (100 km) up.

## FAQ

### How many AU is 1 foot?

One foot equals approximately 2.037 x 10-12 AU. A foot is about 2 trillionths of an AU.

### How many feet are in 1 AU?

One AU contains approximately 4.908 x 1011 feet (about 491 billion feet).

### Is this conversion used in aerospace?

No. Aerospace uses feet for aircraft altitude and AU or kilometers for orbital distances. Direct foot-to-AU conversion is never needed.

## Non-Frequently Asked Questions

### How many feet is it to the Moon?

The Moon is about 0.00257 AU or about 1.26 billion feet away. If you walked at 3 feet per step, that would be about 420 million steps. At 10,000 steps per day, the walk would take about 115,000 years. Bring extra shoes.

### Is the altitude of a plane measurable in AU?

A commercial flight at 35,000 feet is about 7.13 x 10-8 AU. That is 71 billionths of an AU. From the Sun's perspective, you are still on the ground. Altitude is impressive to humans but invisible to astronomy.

### If I grew 1 foot taller, would I be closer to the Sun?

One foot is about 2.04 x 10-12 AU. At the Earth's surface, you are already about 1 AU from the Sun. Growing 1 foot adds 0.0000000002% to that distance. The Sun does not notice your growth spurt.

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## See Also

- [Astronomical Units to Feet](https://www.unitconvertercalculator.com/length/astronomical-units-to-feet/)