How to convert feet (US survey) to astronomical units
1 foot (us survey) is equal to 2.03746623 × 10⁻¹² astronomical units, and 1 astronomical unit is equal to 490,805,680,800 feet (US survey). To convert, multiply by the conversion factor:
astronomical units = feet (US survey) × 2.03746623 × 10⁻¹²
astronomical units = feet (US survey) ÷ 490,805,680,800Example: convert 1 ft (US) to au: 1 × 2.03746623 × 10⁻¹² = 2.03746623 × 10⁻¹² au.
Foot (US Survey) to Astronomical Unit conversion table
| Foot (US Survey) (ft (US)) | Astronomical Unit (au) |
|---|---|
| 0.01 ft (US) | 2.03746623 × 10⁻¹⁴ au |
| 0.1 ft (US) | 2.03746623 × 10⁻¹³ au |
| 1 ft (US) | 2.03746623 × 10⁻¹² au |
| 2 ft (US) | 4.07493246 × 10⁻¹² au |
| 3 ft (US) | 6.112398689 × 10⁻¹² au |
| 5 ft (US) | 1.018733115 × 10⁻¹¹ au |
| 10 ft (US) | 2.03746623 × 10⁻¹¹ au |
| 20 ft (US) | 4.07493246 × 10⁻¹¹ au |
| 50 ft (US) | 1.018733115 × 10⁻¹⁰ au |
| 100 ft (US) | 2.03746623 × 10⁻¹⁰ au |
| 250 ft (US) | 5.093665574 × 10⁻¹⁰ au |
| 500 ft (US) | 1.018733115 × 10⁻⁹ au |
| 1,000 ft (US) | 2.03746623 × 10⁻⁹ au |
About the foot (us survey)
The US survey foot is exactly 1200/3937 m (about 0.3048006 m), two parts per million longer than the international foot. It was officially retired at the end of 2022 but remains in older land records and state plane coordinates.
Symbol: ft (US) · 1 ft (US) = 0.3048006096 m · Category: US survey units
About the astronomical unit
The astronomical unit is exactly 149,597,870,700 m, roughly the average distance from Earth to the Sun. It's used for distances within the solar system.
Symbol: au · 1 au = 149,597,870,700 m · Category: Astronomical