Ok just multiply 72x15 then divide by 100 then you will know how many sq's you have then just see how many bundles come to a sq of the type of shingle you want to put o the roof.

Usually its 3 or 4 bundles per sq. Ok so your answer is 11sq so roughly 44 bundles

Usually its 3 or 4 bundles per sq. Ok so your answer is 11sq so roughly 44 bundles