For a new roof you will also need the same amount of underlayment.
How many shingles for my roof.
Asphalt shingles range in price from about 25 per bundle for a standard 3 tab style to around 50 75 or more for an upgraded architectural style.
It is common to use 3 bundles to a square of shingles.
However if you are using heavier shingles you will require 4 to 5 bundles for a square.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry.
The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square.
However shingles are packaged in a way that they are light enough for the average person to carry around.
Another rule of thumb that can give you a ballpark estimate of the roof area on newly built roofs is to look at the number of sheets of plywood used for the roof deck.
Note that in the last 3 4 years costs of roof shingles and many accessories have gone down by an average of 18 20 currently the us national average for benchmark architectural shingles is around 74 51 square or 25 per bundle.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
Each plywood sheet is 4 x 8 feet or 32 square feet which coincidentally is almost exactly equivalent to the coverage of one bundle of traditional three tab shingles.