Use the square footage of your house, and the size of your roof should be about the same. Be carefull not to include the yard in the footage or anything that is not covered by the roof, then divide the number by the number of stories your house is.
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If the roof has equal pitches [both sides same size] Multiply the length of the roof by length of truss [take size from gutter to ridge] multiply these two sizes in feet then double the answer. that will be your answer.
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The site below that explains the pitch - how to measure it with a calculator to use with pitch and calculate the total footage of your roof
You need to estimate the size of the roof in square feet.A bundle of shingles will cover 33 square feet, so divide the square footage of the roof by 30and that's how many bundles of shingles you'll need.The extra 10% will end up getting used as starters and the cap.Shingling a roof isn't difficult, complete directions are printed on every bundle.But if you've never shingled a roof before you might want to pick up a couple of extra bundles.You can always return them after.
You cannot calculate the square footage of a house roof like this (unless you have a flat roof). The simplest way would be to go up on your roof and measure its different surfaces, however if you dont want to do that, you would need to know several differen things to calculate the surface area -- such as the pitch and angel -- how much hangover you have. Basically you should save yourself time and go up on your roof and measure it