On average an Oz. But it really depends on the dencity of the buds. I've seen and ounce only fill one up 3/4 and I've seen a fluffy ounce that needed to be crammed in. It all depends.
I generally get just under or right at 2 oz. One pheno had really fluffy bud and it was about an ounce and a half in a qt jar. I don't really pack them tight tho.