REarth
Earth radius
The Earth radius here is the mean volumetric radius, 6,371 kilometres, the radius of a sphere with the same volume as the Earth. It is the value used in almost every geophysical formula that treats the planet as a sphere, and it is the standard unit for reporting the sizes of rocky exoplanets.
Watch out: The Earth is an oblate spheroid, so there is no single radius. The equatorial radius is 6,378.137 km and the polar radius 6,356.752 km, a difference of 21 km. The IAU nominal value used for exoplanet radii is the equatorial one, so an exoplanet quoted at "1.0 R⊕" is being compared against 6,378 km rather than the 6,371 km here.
| 1 REarth | 6,371,000 m |
Solvers that use length