Earth's Polar Radius to Kilometer Converter
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Instant · Precise · Universal
32 units available
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How to Convert Earth's Polar Radius to Kilometer
To convert Earth polar radii to meters: multiply by 6,356,752.3.
R⊕(polar) = 6,356,752.3 m. It is about 21.385 km shorter than the equatorial radius.
For example, 1 Earth's Polar Radius (R⊕ (polar)) = 6356.7523 Kilometer (km).
Earth's Polar Radius to Kilometer — Common Values
| Earth's Polar Radius (R⊕ (polar)) | Kilometer (km) |
|---|---|
| 0.1 | 635.67523 |
| 0.5 | 3178.37615 |
| 1 | 6356.7523 |
| 2 | 12713.5046 |
| 5 | 31783.7615 |
| 10 | 63567.523 |
| 25 | 158918.8075 |
| 50 | 317837.615 |
| 100 | 635675.23 |
| 500 | 3178376.15 |
| 1000 | 6356752.3 |
About Earth's Polar Radius (R⊕ (polar))
Definition
The Earth's polar radius is the distance from Earth's center to either pole, approximately 6,356.752 km.
Mathematical Relationship
R⊕(polar) = 6,356,752.3 m. It is about 21.385 km shorter than the equatorial radius.
Conversion Formula
To convert Earth polar radii to meters: multiply by 6,356,752.3.
Practical Applications
Geodetic calculations, gravity modeling, and precise cartography near the poles.
Interesting Facts
At the poles, you are about 21 km closer to Earth's center than at the equator — you weigh very slightly more!
Common Mistakes
Approximating Earth as a perfect sphere — the difference between equatorial and polar radii matters for precision applications.
Educational Tips
Earth's shape (oblate spheroid) is like a slightly squished ball — wider at the equator, flatter at the poles.
About Kilometer (km)
Definition
The kilometer is a unit of length equal to 1,000 meters, commonly used to express distances between geographic locations.
Mathematical Relationship
1 km = 1,000 m = 100,000 cm = 0.621371 miles. There are 1.60934 km in one mile.
Conversion Formula
To convert km to miles: multiply by 0.621371. To convert miles to km: multiply by 1.60934.
Practical Applications
Road signs, marathon distances (42.195 km), GPS navigation, geographic mapping, and aviation flight distances.
Interesting Facts
A marathon is 42.195 km. The circumference of Earth is approximately 40,075 km at the equator.
Common Mistakes
Assuming 1 km = 1 mile. A kilometer is only about 62% of a mile. Also, speed: 100 km/h ≈ 62 mph, not 100 mph.
Educational Tips
Quick approximation: multiply km by 0.6 to estimate miles, or multiply miles by 1.6 for km.