When talking about the area of a roof, remember that it is not the same as the square footage of the structure. For example a 20 x 30' building with a 12" overhang and a 4/12 pitch will have 736 sq ft of roof vs only 600 sq ft of slab.
One square of shingles covers 100 square feet. 15 year shingles come 3 bundles to a square. 25 year come 4 bundles to a square.
4 bundles
Most shingles come 3 bundles per square(100 sq. ft.), so you would have 4200 bundles for 1400 sq, but only 42 if you are asking about 1400 sq. ft.
6 bundles @ 33 1/3 sq. ft. each = 200 sq. ft.
3 bundles = 1 square 10 2/3 sq x 3 bundles = 32 bundles
3 bundles to a square and 100 sq. ft. in a square, so 3 times 16 equals 48. Depending on how much roof edge and peak add a couple bundles for starter strip and the cap.
Typically there are three (3) bundles per square (100 sq ft)
Usually there is 3 bundles to the Sq . and a Sq. is 10'x10' or 100 Sq. Ft. You have to allow a bundle or three for the ridge and starter courses so your answer would be approxmently 72 .
42
3 bundles makes one sq
9 bundles assuming std. 3 bundle/sq. shingles
7
You are going to need 4 bundles. 3 bundles equals a square and a square equals 100 square feet.