The standard height of a household toilet is 14 to 15 inches. Toilet bowls usually come in two different shapes: the elongated oval bowl, which provides more comfort, and the round bowl, which takes up less room and is best for smaller spaces.
The elongated bowl is usually 18 to 19 inches long and about 18 inches wide. The round toilet bowl is usually 16 to 17 inches long and 14 inches wide. There are also toilet models that are 16 to 17 inches high which are ADA approved and are popular among people who are very tall, as well as people who are physically challenged.