Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 au | 4.90814e+08 ft | |
| 0.01 au | 4.90814e+09 ft | |
| 0.1 au | 4.90814e+10 ft | |
| 1 au | 4.90814e+11 ft | |
| 5 au | 2.45407e+12 ft | |
| 10 au | 4.90814e+12 ft | |
| 50 au | 2.45407e+13 ft | |
| 100 au | 4.90814e+13 ft | |
| 1000 au | 4.90814e+14 ft |
Multiply the number of Astronomical Units by 490814000000 to get Foots. Formula: ft = au × 490814000000. Example: 10 au × 490814000000 = 4.9081×1012 ft. To reverse, divide Foots by 490814000000 to get Astronomical Units.
| Astronomical Unit (au) | Foot (ft) |
|---|---|
| 0.001 au | 490814000 ft |
| 0.01 au | 4908140000 ft |
| 0.1 au | 49081400000 ft |
| 0.5 au | 245407000000 ft |
| 1 au | 490814000000 ft |
| 2 au | 981627000000 ft |
| 5 au | 2.4541×1012 ft |
| 10 au | 4.9081×1012 ft |
| 20 au | 9.8163×1012 ft |
| 50 au | 2.4541×1013 ft |
| 100 au | 4.9081×1013 ft |
| 250 au | 1.227×1014 ft |
| 500 au | 2.4541×1014 ft |
| 1000 au | 4.9081×1014 ft |
| 10000 au | 4.9081×1015 ft |
To convert Astronomical Unit to Foot, multiply by 490814000000. Example: 10 au = 4.9081×1012 ft
To convert Foot back to Astronomical Unit, divide by 490814000000 (multiply by 2.0374×10-12). Use the swap button above.
Start with 100 Astronomical Units = 4.9081×1013 ft as your reference point. Scale up or down from there.
American aerospace engineers who work in US customary units (feet, inches) regularly convert AU distances to feet when writing mission documentation, press releases, or interfacing with US-customary-based legacy software systems.
US-based mission planners express spacecraft travel distances in AU for scientific context, then convert to feet or miles for engineering budgets and hardware specifications still using US customary units.
American astronomy teachers use AU-to-foot conversions to make stellar distances tangible for students: "The Earth-Sun distance is 490 billion feet — that's how many footsteps to walk to the Sun."
Popular science in the US regularly converts AU to feet for scale comparison — "Jupiter is 5.2 AU from the Sun, which is about 2.7 trillion feet" — helping audiences connect abstract astronomical distances to everyday measurement.
US radio telescope engineers specify dish diameters and baseline distances in feet while referencing source distances in AU — particularly for solar system radar astronomy and near-Earth object tracking.
Early NASA mission reports used feet for all distances. Converting these AU-based orbital parameters to feet — and back — remains necessary when referencing historic Apollo-era and Pioneer-era mission documentation.
The Astronomical Unit is a unit of Length measurement (symbol: au). 1 au = 490814000000 ft. Used in scientific and practical Length measurement applications.
The Foot is a unit of Length measurement (symbol: ft). It is part of an internationally recognised measurement system used alongside the Astronomical Unit.
The astronomical unit has ancient roots — Aristarchus of Samos attempted to measure the Earth-Sun distance around 270 BC, estimating it at 18–20 lunar distances (the true value is about 390). For centuries the AU was estimated using Venus transit observations and trigonometry. Edmond Halley organised the first coordinated international transit-of-Venus expedition in 1716 to measure it precisely. The modern value was determined by radar ranging to Venus in 1961. The IAU formally defined the AU as exactly 149,597,870,700 metres in 2012 — a fixed constant of physics, not a measured distance.
The foot is one of humanity's oldest measurement units, used by ancient Egyptians, Greeks, and Romans — each with slightly different values. The English statute foot was standardised at 12 inches in 1305 under King Edward I. Its definition was refined multiple times over centuries, finally fixed as exactly 0.3048 metres under the International Yard and Pound Agreement of 1959, signed by the US, UK, Canada, Australia, and South Africa. Today the foot remains official in the US, UK (for aviation and road distances), and international aviation worldwide.
Common use: Astronomical Unit to Foot conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.