What is the diameter of Saturn?

Excluding its rings, the mean diameter of planet Saturn is approximately 120,000 km (74,500 miles), more than 8 times the diameter of Earth:

120,536 ± 8 km at the equator (74,898 miles),
and 108,728 ± 20 km through the poles. (67,560 miles).

The difference between the equatorial and polar diameters is due to the rapid spin and fluid nature of the planet, which causes the equator to bulge significantly.