Eight inches is approximately the width of a standard sheet of notebook or printer paper. This length is also two-thirds of the length of a foot-long ruler.
In metric units, eight inches is equal to 203.20 millimeters or 20.320 centimeters. The screen height of most tablet computers is about eight inches, though many models are an inch or two larger or smaller. Eight inches is equal to two "hands," where a hand is a unit of measure traditionally used to measure the height of a horse, originally based on the average breadth of a human hand. Fossilized teeth belonging to the carnivorous dinosaur Tyrannosaurus Rex have been discovered that are up to eight inches long.