Small, they would only seem as small children to your eyes. Average height being three foot six or so. Also, they have hairy feet, and a keen intrest in the brewing of Ale and pipeweed, the most famoust being Old Toby (the finest weed in the south farthing). Hobbits can also been known as halflings (because they are half the height of the average human) and Shirefolk (Since thats where alot of them live)
Zel: When i grow up, i wanna be a hobbit! And i will live in the shire in bagshot row under the party tree
Sam: Well, youre definately small enough...