I took the following from a website that sells roofing materials ....at first I wasn't sure that I was reading what I was reading. A bundle of shingles contains approximately 33 square feet of coverage. Material and labor for roofing is most often priced by the "square," which is a 10' by 10' area of roofing coverage. A bundle of shingles will constitute approximately three squares. These costs only include dimensional shingles. Many other materials are required for a complete roofing job.