A full grown cow weighs between 1,000 lbs to 1,321 lbs but cows are usually slaughtered for meat before they reach that weight range.
The average weight of a cow that is slaughtered is around 1,300 lbs or a bit more.
Out of a 1,000 lb cow you typically get around 430 lbs of meat that can be sold to retail or eaten after we factor in an 18% loss of weight for the other inedible parts of the cow.