Do all PFD's have the same amount of buoyancy?

All CCG Approved Adult PFD's have the same minimum amount of buoyancy, 15-1/2lbs. As a reference, the average adult weighs approximately 8lbs in the water.

Many larger people will ask the question, "How do I know the PFD will float me?". For larger sized people, they can be assured that the device will float them. An approved PFD has a minimum of 15-1/2lbs of buoyancy - larger sizes, incrementally increase in buoyancy simply by the increase in surface area and the resulting increase in the amount of foam required to make that size. The rule is "If it fits you, it will float you".