Convert Earth's Polar Radius to Mile
Convert earth's polar radii to miles instantly. 1 earth's polar radius = 3949.9025689971 mile — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Mile to Earth's Polar Radius converter for the reverse conversion.
Units explained
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.
Mile
A mile (statute mile) is an Imperial and US customary unit of length equal to 5,280 feet or exactly 1,609.344 meters. It is the standard unit for road distances in the United States and the United Kingdom.
The mile derives from the Roman mille passus ("thousand paces" — about 1,480 meters). The English statute mile was fixed at 5,280 feet by the Weights and Measures Act of 1593, and exactly defined as 1,609.344 m by the 1959 International Yard and Pound Agreement.
Miles are used in the US and UK for road signs, speed limits (mph), athletic events (one-mile run), and geographic distances. Aviation also uses statute miles for some visibility measurements.
Roman origin (mille passus); English statute mile fixed at 5,280 feet in 1593; standardized to 1,609.344 m exactly by the 1959 International Yard and Pound Agreement.
Earth's Polar Radius to Mile conversion formula
The relationship between earth's polar radii and miles:
To convert earth's polar radii to miles, multiply the value in earth's polar radii by 3949.9025689971. To reverse, multiply miles by 0.0002531708.
How to use this converter
Type a value into the calculator. The result in miles updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Mile to Earth's Polar Radius converter for the reverse direction.
Step-by-step: convert earth's polar radii to miles
- Write down the value in earth's polar radii (R⊕,p).
- Multiply that value by the factor 3949.9025689971.
- The product is the equivalent value in miles (mi).
- To reverse, multiply the mile value by 0.0002531708.
Worked examples
Example 1 — Convert 1 R⊕,p to mi:
1 × 3949.9025689971 = 3949.9025689971 mi
Example 2 — Convert 100 R⊕,p to mi:
100 × 3949.9025689971 = 394990.2568997057 mi
Earth's Polar Radius to Mile conversion table
Standard reference values for converting earth's polar radii to miles:
| Earth's Polar Radius [R⊕,p] | Mile [mi] |
|---|---|
| 0.01 | 39.49902569 |
| 0.1 | 394.9902568997 |
| 1 | 3949.9025689971 |
| 2 | 7899.8051379941 |
| 3 | 11849.7077069912 |
| 4 | 15799.6102759882 |
| 5 | 19749.5128449853 |
| 10 | 39499.0256899706 |
| 20 | 78998.0513799411 |
| 30 | 118497.0770699117 |
| 40 | 157996.1027598823 |
| 50 | 197495.1284498529 |
| 100 | 394990.2568997057 |
| 500 | 1974951.2844985286 |
| 1000 | 3949902.5689970572 |
Frequently asked questions
How many miles is 1 earth's polar radius?
How do I convert earth's polar radii to miles?
How do I convert miles back to earth's polar radii?
How many miles is 100 earth's polar radii?
Popular length unit conversions
Convert Earth's Polar Radius to other length units
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Metric / SI (4 units)
Imperial / US Customary (4 units)
Astronomical (8 units)
Sources & references
Conversion factor (1 R⊕,p = 3949.9025689971 mi) 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.