Big macs are not all that “Big”... they are just a cheesebuger with an extra heel in between with an extra patty some lettuce and some 1000 island dressing, they use 10:1 meat patties that is 1/10th of a lb.
A quarter pounder 4:1 patty is a lot bigger since the patty shrinks less tyhan the 10:1 meat during cooking.