How big is Uranus?

Uranus is the third largest planet in the Solar System. It has a diameter of 31,518.4 miles or 50,724 kilometers which is about four times the diameter of Earth. Uranus has a volume which is about 63 times the volume of Earth which means that 63 Earths can fit inside Uranus.

NASA maintains a page with a lot of information about Uranus; see: https://science.nasa.gov/uranus/.