Depending on which manufacturer of starter shingles you prefer, you will get 100 linear feet, give or take a couple of feet for some brands. If using 3-tab shingles as a starter shingle, you will get roughly 78 linear feet per bundle.
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There are 3 bundles of shingles in every square. A square is 100 square feet. In 23 bundles, you would have 766 square feet approximately
Divide the square footage by the width in feet. Example: 20 sq. ft roll of material is made up of 10 linear feet by 2 feet in width. 20 square feet divided by 2 feet wide equals 10 linear feet and 2 feet wide. For linear feet ask yourself how long is it. 100 sq. ft. 1 foot wide would be 100 linear feet long.
A 10 X 10 area or 100 square feet.
A square of asphalt shingles, installed according to mfg instructions, covers 100 sq. ft.
LINEAL is actually an incorrect term for measurement - it refers to ancestry or heredity. The correct term is LINEAR and one (1) linear foot equals 12". To convert linear feet to square feet depends on the width you are measuring, i.e., 100 linear feet x 1 foot wide equals 100 square feet; 100 linear feet x 6" wide equals 50 square feet and so on.