A little smaller than a standard toilet.Actually it’s perfect size unless you’re an extremely large person. The .8  gallon flush works every time so that you literally almost never need to use the 1.28 gallons button. Easy to clean. We have one that’s 4 years old that works perfect and just ordered 3 more for the rest of the house. I have used TOTO, AMERICAN Standard champion 4 (all of which leak because of a design flaw regardless if you buy new gaskets.). Even have Koehler Wellworth. 13 toilets between our 2 homes and everyone likes these the best. Saves space but again they are smaller than a standard toilet.