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(Some large round bales can be made a lot lighter and smaller: see the other answers made here.) The large square bales average out at around 1000 to 1200 pounds for straw and I believe around 1400 for hay. Dimensions I've pegged at about 48 tall by 70 long by 48 wide.
A round bale weighs anything from 700 to 2000 pounds on average in the USA. A small square bale weighs from 40 to 100 pounds and large square bales weigh from 140 to 2000 pounds depending on how they were baled. So a 700 pound round bale could contain 17.5 small 40 pound bales or 5 of the 140 lb large squares. A 2000 lb round bale could contain 50 of the small 40 lb bales, 14.3 of the 140 lb bales, or one of the 2000 lb bales.