What is Jupiter's mean radius in kilometers?

Jupiter’s mean radius is 69,911 kilometers.

Mean radius, also called volumetric radius, is the radius of a sphere having the same volume as the planet. This measurement is useful because Jupiter is not perfectly spherical. Its rapid rotation—one complete turn takes roughly ten hours—causes the planet to bulge at the equator and flatten somewhat at the poles.

Jupiter’s equatorial radius is larger than its polar radius, so different references may list several radius values depending on which dimension they mean. The figure 69,911 km is the standard mean-radius value used in planetary data. It corresponds to a diameter of about 139,822 km, making Jupiter roughly eleven times wider than Earth.

The smaller options in this quiz describe other objects or are far too small for Jupiter. Earth’s mean radius, for example, is about 6,371 km, while Jupiter’s immense size is a defining characteristic of the gas giant.