CAP rate and capital gain are two completely different terms and not related.
CAP rate is a price or value placed on a property via a multiple of Net Operating Income (NOI).
Capital Gain is the amount of gain you have when you sell something and the amount that is (typically) taxable at the capital gains rate.
Google the terms and where you find good real estate term definitions you will probably also find the way to correctly calculate value on certain cap rates.
Jan 17, 2011