Tolkien describes Hobbits

 

The Lord of the Rings (1954)

For they are a little people, smaller than Dwarves: less stout and stocky, that is, even when they are not actually much shorter. Their height is variable, ranging between two and four feet of our measure. They seldom now reach three feet...As for the Hobbits of the Shire, with whom these tales are concerned, in the days of their peace and prosperity they were a merry folk. They dressed in bright colours, being notably fond of yellow and green; but they seldom wore shoes, since their feet had tough leathery soles and were clad in a thick curling hair, much like the hair of their heads, which was commonly brown. ... they had long and skilful fingers and could make many other useful and comely things. Their faces were as a rule good-natured rather than beautiful, broad, bright-eyed, red-cheeked, with mouths apt to laughter, and to eating and drinking. And laugh they did, and eat, and drink, often and heartily, being fond of simple jests at all times, and of six meals a day (when they could get them). They were hospitable and delighted in parties, and in presents, which they gave away freely and eagerly accepted.

Letter 27 (1938)

I picture a fairly human figure, not a kind of ‘fairy’ rabbit as some of my British reviewers seem to fancy: fattish in the stomach, shortish in the leg. A round, jovial face; ears only slightly pointed and ‘elvish’; hair short and curling (brown). The feet from the ankles down, covered with brown hairy fur. Clothing: green velvet breeches; red or yellow waistcoat; brown or green jacket; gold (or brass) buttons; a dark green hood and cloak (belonging to a dwarf).

Actual size – only important if other objects are in picture – say about three feet or three feet six inches.

 

The Hobbit (1937)

I suppose hobbits need some description nowadays, since they have become rare and shy of the Big People, as they call us. They are (or were) a little people, about half our height, and smaller than the bearded Dwarves. Hobbits have no beards. ... They are inclined to be fat in the stomach; they dress in bright colours (chiefly green and yellow); wear no shoes, because their feet grow natural leathery soles and thick warm brown hair like the stuff on their heads (which is curly); have long clever brown fingers, good-natured faces, and laugh deep fruity laughs (especially after dinner, which they have twice a day when they can get it).