Convert Feet to Earth Radius
Convert Feet (ft) to Earth Radius (R⊕) instantly and accurately.
Conversion Formula
R⊕ = ft × 4.778852636e-8
About Feet
A foot (ft) is equal to 12 inches or 30.48 centimeters, originally based on the length of a human foot. It remains widely used in the United States and some other countries for measuring height, room dimensions, and distances. For reference, a standard door is about 6.5-7 feet tall, ceiling height in homes is typically 8-9 feet, and a basketball hoop stands 10 feet high. The foot is also used in aviation (altitude) and real estate (square footage).
About Earth Radius
The Earth radius (R⊕) is approximately 6.371 million meters or 6,371 kilometers, representing the average distance from Earth's center to its surface. Due to Earth's rotation, it's slightly flattened, with the equatorial radius being about 21 km larger than the polar radius. This fundamental measurement is crucial in geology, geography, and astronomy for calculating Earth's circumference (about 40,000 km), surface area, and volume. It's also used as a comparative unit for describing other planets and exoplanets.
Quick Reference Table
| Feet (ft) | Earth Radius (R⊕) |
|---|---|
| 1 ft | 4.779 × 10-8 R⊕ |
| 2 ft | 9.558 × 10-8 R⊕ |
| 5 ft | 2.389 × 10-7 R⊕ |
| 10 ft | 4.779 × 10-7 R⊕ |
| 25 ft | 1.195 × 10-6 R⊕ |
| 50 ft | 2.389 × 10-6 R⊕ |
| 100 ft | 4.779 × 10-6 R⊕ |