The Way We War

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As I recall, a range of four feet max down to two feet min, and commonly three to three-six.

From the prologue:

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; but they have dwindled, they say, and in ancient days they were taller. According to the Red Book, Bandobras Took (Bullroarer), son of Isengrim the Second, was four foot five and able to ride a horse. He was surpassed in all Hobbit records only by two famous characters of old; but that curious matter is dealt with in this book.