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26 feet
Easy way to figure it: If the roll is 3 feet by 100 feet, it would cover 300 square feet. But you have to overlap it about 6 inches at top and bottom, so once you subtract that, it would cover about 200 square feet., When figuring a job, add some for overlap at valleys, chimneys, etc. . . Hope this helps. A standard roll of 30# felt covers 216 square feet; one-half the area of a roll of 15# felt, which covers 432 square feet. Rows are overlapped 2 inches, not 6 inches.
15 lb. has 400 sq. ft. 30 lb. has 200 sq. ft.
The roll has 12.5 square feet of material.
15 lb. 400 sq. ft. 30 lb. 200 sq. ft.