I pound of lobster will yield around 1 1/3 cups of lobster and 2 lbs of lobster will give you around 2 or 3 cups of lobster.
So there are around 1 1/3 cup of lobster in 1 pound of lobster.
If you have 2 lbs of lobster you should get around 2 cups to 2 and 1/4 cups of lobster from the 2 lbs of lobster.
When you cook a lobster 1 lobster will typically give you 3 ΒΌ ounces of meat from the lobster.
Because some of the weight is in the shell and not all in the meat.