How big is a white rhinoceros?

Up to about four meters long, not counting the tail. That is 3.8 m (12.5 ft) long.

3.8 m long · 12.5 ft

Up to about four meters long, not counting the tail.

Average person 1.7 m

White rhinoceros 3.8 m

White rhinoceros next to average person, drawn to scale.

Compared with things you know

A white rhinoceros is about 2.2× the height of an average person Average person: 1.7 m
A white rhinoceros is about 1.9× the height of a basketball player Basketball player: 2 m
A white rhinoceros is about 1.9× the height of a door Door: 2.03 m
A white rhinoceros is about 1/1.2 the length of a family car Family car: 4.5 m

Think you could size it by eye? A white rhinoceros is one of the objects in Sizedle.