As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
How many shingles for my roof.
For a new roof you will also need the same amount of underlayment.
The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square.
It is common to use 3 bundles to a square of shingles.
When you are using 3 bundles for a square you will be getting 29 standard shingles in each bundle.
The result is 240 and this means you would need 240 squares of shingles to cover that roof.
However shingles are packaged in a way that they are light enough for the average person to carry around.
However if you are using heavier shingles you will require 4 to 5 bundles for a square.
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.
How many bundles of shingles will you need the average bundle of shingles covers 33 3 ft 2 so three bundles of shingles are needed per square.
Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.