Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ft | 2.037e-15 au | |
| 0.01 ft | 2.037e-14 au | |
| 0.1 ft | 2.037e-13 au | |
| 1 ft | 2.037e-12 au | |
| 5 ft | 1.019e-11 au | |
| 10 ft | 2.037e-11 au | |
| 50 ft | 1.019e-10 au | |
| 100 ft | 2.037e-10 au | |
| 1000 ft | 2.03743e-09 au |
Multiply the number of Foots by 2.0374×10-12 to get Astronomical Units. Formula: au = ft × 2.0374×10-12. Example: 10 ft × 2.0374×10-12 = 2.0374×10-11 au. To reverse, divide Astronomical Units by 2.0374×10-12 to get Foots.
| Foot (ft) | Astronomical Unit (au) |
|---|---|
| 0.001 ft | 2.0374×10-15 au |
| 0.01 ft | 2.0374×10-14 au |
| 0.1 ft | 2.0374×10-13 au |
| 0.5 ft | 1.0187×10-12 au |
| 1 ft | 2.0374×10-12 au |
| 2 ft | 4.0749×10-12 au |
| 5 ft | 1.0187×10-11 au |
| 10 ft | 2.0374×10-11 au |
| 20 ft | 4.0749×10-11 au |
| 50 ft | 1.0187×10-10 au |
| 100 ft | 2.0374×10-10 au |
| 250 ft | 5.0936×10-10 au |
| 500 ft | 1.0187×10-9 au |
| 1000 ft | 2.0374×10-9 au |
| 10000 ft | 2.0374×10-8 au |
To convert Foot to Astronomical Unit, multiply by 2.0374×10-12. Example: 10 ft = 2.0374×10-11 au
To convert Astronomical Unit back to Foot, divide by 2.0374×10-12 (multiply by 490814000000). Use the swap button above.
Start with 100 Foots = 2.0374×10-10 au as your reference point. Scale up or down from there.
American aerospace engineers who work in feet for hardware specifications convert to AU when calculating orbital parameters, spacecraft distances, and mission timelines for deep-space missions like Voyager and New Horizons.
Educators building scale models of the solar system using feet as the base unit (to keep models room-sized) convert planet distances from AU to feet — at 1 foot = 1 million km, the solar system fits in a school corridor.
US-based amateur astronomers familiar with feet convert planetary approach distances from AU to feet for comparison with familiar distances — "this asteroid passes within X feet of Earth" makes cosmic distances tangible.
US university physics students convert between feet (US customary) and AU (astronomical) in dimensional analysis exercises, practising multi-step unit conversion across the full range of SI and non-SI systems.
1 AU = 4.908×10¹¹ feet — nearly 500 billion feet. Science communicators use this to make the Earth-Sun distance viscerally real for American audiences who think in feet rather than metres or kilometres.
NASA public affairs writers express spacecraft distances in both AU (for scientific precision) and billion feet (for American general audiences) in the same press release — requiring systematic conversion.
The Foot is a unit of Length measurement (symbol: ft). 1 ft = 2.0374×10-12 au. Used in scientific and practical Length measurement applications.
The Astronomical Unit is a unit of Length measurement (symbol: au). It is part of an internationally recognised measurement system used alongside the Foot.
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 road distances and aviation), and international aviation worldwide.
The astronomical unit has ancient roots — Aristarchus of Samos attempted to measure the Earth-Sun distance around 270 BC. For centuries the AU was estimated using Venus transit observations. Edmond Halley organised the first coordinated international transit-of-Venus expedition in 1716. 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.
Common use: Foot to Astronomical Unit conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.