How many feet are in 1 AU?

One AU contains approximately 4.908 x 1011 feet (about 491 billion feet). This derives from 1 AU = 149,597,870,700 meters x 3.28084 feet/meter.

How far is the Moon in AU?

The Moon is about 1,261,000 feet (238,855 miles / 384,400 km) from Earth, which equals approximately 0.00257 AU. The Moon is very close on the astronomical scale.

Is this conversion used in aerospace?

Rarely. Aerospace engineers use feet for aircraft altitude and AU or kilometers for orbital distances. The conversion might appear when comparing aircraft altitude with satellite orbital distances for educational purposes.

Astronomical Units to Feet (au to ft) Converter

1 au = 490,806,662,401.5748 ft

1 Astronomical Unit equals 490,806,662,401.5748 Feet (1 au = 490,806,662,401.5748 ft). Convert Astronomical Units to Feet with formula, table, and examples.

One astronomical unit equals approximately 4.908 x 10¹¹ feet, or about 491 billion feet. This conversion expresses the Earth-Sun distance in the everyday American length unit. While the number is enormous, it helps Americans conceptualize astronomical distances in units they understand intuitively.

How to Convert Astronomical Units to Feet

ft = au × 490,806,662,401.5747680664

Multiply the value in Astronomical Units by 490,806,662,401.5747680664

Take your value in Astronomical Units
Multiply by 490,806,662,401.5747680664
Read the result in Feet

Common Astronomical Units to Feet Conversions

Astronomical Units (au)	Feet (ft)	Status
1 × 10⁻¹⁰ au	49.0807 ft
1 × 10⁻⁹ au	490.8067 ft
1 × 10⁻⁸ au	4,908.0666 ft
1 × 10⁻⁷ au	49,080.6662 ft
0.000001 au	490,806.6624 ft
0.00001 au	4,908,066.624 ft
0.0001 au	49,080,666.2402 ft
0.001 au	490,806,662.4016 ft
0.01 au	4,908,066,624.0158 ft
0.1 au	49,080,666,240.1575 ft
1 au	490,806,662,401.5748 ft

Good to Know About Astronomical Units to Feet Conversion

American aviation uses feet for altitude, but space missions switch to kilometers or AU once past the atmosphere. The transition from feet to AU happens roughly at the boundary between aviation and space exploration, around 100 km (328,000 feet) altitude.

Astronomical Units to Feet: What You Need to Know

The Earth-Sun distance of 1 AU is about 491 billion feet. A commercial airplane cruising at 35,000 feet is at 0.0000000234 AU altitude. The Moon at about 1.26 million feet from Earth is only 0.00257 AU away. These comparisons help put solar system distances into perspective for people who think in feet.

What is a 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.

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Learn more about Astronomical Unit →

What is a 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.

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Learn more about Foot →

Going the other way? Use our Feet to Astronomical Units converter.

Astronomical Units to Feet FAQ

One AU contains approximately 4.908 x 10¹¹ feet (about 491 billion feet). This derives from 1 AU = 149,597,870,700 meters x 3.28084 feet/meter.
The Moon is about 1,261,000 feet (238,855 miles / 384,400 km) from Earth, which equals approximately 0.00257 AU. The Moon is very close on the astronomical scale.
Rarely. Aerospace engineers use feet for aircraft altitude and AU or kilometers for orbital distances. The conversion might appear when comparing aircraft altitude with satellite orbital distances for educational purposes.

Non-Frequently Asked Questions About Astronomical Units to Feet

Questions nobody should ask - but someone did.

Average step is about 2.5 feet. One AU is about 4.908 x 10¹¹ feet, so roughly 196 billion steps. At 5,000 steps per day (the average), it would take about 107,000 years of walking. Pack sunscreen. And a sandwich. And several evolutionary epochs.
If the Earth-Sun distance (1 AU) shrank to a football field (300 feet), Earth would be about 0.003 inches across - smaller than the period at the end of this sentence. The Sun would be about 0.35 inches, the size of a pea. Football is not the right sport for astronomy.
Aircraft altitude is measured in feet up to about 60,000 feet. Above that, space is measured in kilometers, AU, and parsecs. The foot stops being useful at roughly the boundary between atmosphere and space. Feet are grounded - literally.