How are Roof Shingles sold?

Roof shingles are typically sold by the bundle, with each bundle covering a specific area, usually around 33 square feet, depending on the type and brand. They can also be sold by the square, which represents an area of 100 square feet. Retailers offer various options, including asphalt, wood, metal, and slate shingles, and they often provide information on the number of bundles needed based on the roof's square footage. Additionally, shingles can be purchased at home improvement stores, roofing supply companies, or through contractors.