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The square footage of your house is not the same as the square footage of your roof if there is any pitch. If you are asking aboutasphalt shingles, generally each bundle covers 33.3 square feet. Therefore find the square footage of your roof, divide it by 33.3 to find the number of bundles, then multiply the original square footage by 5-10% to get the number of additional bundles for cutoffs and starter strip. The variation in percentage accounts for the number and length of valleys of the roof. Example:[@5%]roof =1500 ft2 --> (1500/33.3=45.05) (1500x.05=75 -->75/33.3=2.25)45.05 + 2.25= (48) bundles
In an average house it would be about 1500 sq. feet
48.3% of 1500 = 724.5= 48.3% * 1500= 0.483 * 1500= 724.5
29% of 1500= 29% * 1500= 0.29 * 1500= 435
90% of 1500= 90% * 1500= 0.9 * 1500= 1,350