Convert Foot to Earth's Polar Radius
Convert feet to earth's polar radii instantly. 1 foot = 4.794902e-8 earth's polar radius — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Earth's Polar Radius to Foot converter for the reverse conversion.
Units explained
Foot
A foot is an Imperial and US customary unit of length equal to 12 inches or exactly 0.3048 meters. It is the most commonly used unit of length in everyday measurement in the United States.
The foot's origin is literally the length of a human foot, used as a measurement standard since antiquity. The English foot was standardized at various points in history; the modern international foot (0.3048 m exactly) was fixed by the 1959 International Yard and Pound Agreement.
Feet are used in the US for body height, building dimensions, room sizes, road sign clearances, aviation altitude (feet above sea level), and most everyday distance estimation. The UK uses feet informally for height despite officially being metric.
Used since antiquity; standardized to 0.3048 m exactly by the International Yard and Pound Agreement of 1959. Aviation worldwide uses feet for altitude despite metric adoption elsewhere.
Earth's Polar Radius
Earth's polar radius is the distance from the planet's center to either pole, approximately 6,356,752 meters under the WGS84 geodetic reference system. The polar radius is about 21 km shorter than the equatorial radius due to Earth's oblate spheroid shape.
Derived from WGS84's flattening parameter (f ≈ 1/298.257); the difference from the equatorial radius is the geometric signature of Earth's rotational oblateness.
Earth's polar radius is used in geodesy, satellite-orbit calculations, and global cartography. Together with the equatorial radius it defines Earth's reference ellipsoid in WGS84.
Derived from the WGS84 reference ellipsoid adopted in 1984; the value is computed from the equatorial radius minus the oblateness.
Foot to Earth's Polar Radius conversion formula
The relationship between feet and earth's polar radii:
To convert feet to earth's polar radii, multiply the value in feet by 4.794902e-8. To reverse, multiply earth's polar radii by 2.085549e+7.
How to use this converter
Type a value into the calculator. The result in earth's polar radii updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Earth's Polar Radius to Foot converter for the reverse direction.
Step-by-step: convert feet to earth's polar radii
- Write down the value in feet (ft).
- Multiply that value by the factor 4.794902e-8.
- The product is the equivalent value in earth's polar radii (R⊕,p).
- To reverse, multiply the earth's polar radius value by 2.085549e+7.
Worked examples
Example 1 — Convert 1 ft to R⊕,p:
1 × 4.794902e-8 = 4.794902e-8 R⊕,p
Example 2 — Convert 100 ft to R⊕,p:
100 × 4.794902e-8 = 4.794902e-6 R⊕,p
Real-world example — Maritime depth conversion
A 10-foot sounding depth converts cleanly into earth's polar radii. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ft × 4.794902e-8 = 4.794902e-7 R⊕,p
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 ft × 4.794902e-8 = 4.794902e-8 R⊕,p
Real-world example — Adult height conversion
A 1.8-foot-tall person measures a value in earth's polar radii that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 ft × 4.794902e-8 = 8.630823e-8 R⊕,p
Foot to Earth's Polar Radius conversion table
Standard reference values for converting feet to earth's polar radii:
| Foot [ft] | Earth's Polar Radius [R⊕,p] |
|---|---|
| 0.01 | 4.794902e-10 |
| 0.1 | 4.794902e-9 |
| 1 | 4.794902e-8 |
| 2 | 9.589803e-8 |
| 3 | 1.43847e-7 |
| 4 | 1.917961e-7 |
| 5 | 2.397451e-7 |
| 10 | 4.794902e-7 |
| 20 | 9.589803e-7 |
| 30 | 1.43847e-6 |
| 40 | 1.917961e-6 |
| 50 | 2.397451e-6 |
| 100 | 4.794902e-6 |
| 500 | 2.397451e-5 |
| 1000 | 4.794902e-5 |
Frequently asked questions
How many earth's polar radii is 1 foot?
How do I convert feet to earth's polar radii?
How do I convert earth's polar radii back to feet?
How many earth's polar radii is 100 feet?
Popular length unit conversions
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 ft = 4.794902e-8 R⊕,p) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.