What Is a Square of Shingles?


A square of shingles is a standardized measurement used by contractors that applies to shingles of any size based on their ability to cover a certain area of roof.

Shingles and Roofing

  • Shingles are the building block of many roof styles, as contractors attach them to plywood sheathing to protect the roof from the elements.

Square Definition

  • A square is the number of shingles it would take to cover 100 square feet of roof area with each row of shingles covering the tabs of the layer below it.


  • Shingles are packaged in bundles that include a number of strips of roofing. Twenty-seven strips equal a bundle, generally speaking, and roughly three to four compose a square.

Shingle Size Issues

  • Since a square of shingles must cover the same amount of area, more shingles would be necessary if they were of a smaller size, and vice versa.

Bundle Differences

  • While a square is a square, the number of bundles it takes to have a square of shingles is dependent on the size of the shingles used and the construction of tabs to attach to the sheathing.

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