A bundle of asphalt roofing shingles typically weighs between 60 and 80 pounds, and a bundle of cedar shingles typically weighs between 40 and 80 pounds. Shingles are usually measured by the square, which in roofing terminology is the number of shingles needed to cover 100 square feet.
Shingles are wrapped in bundles, and the number of bundles needed to cover a square varies by the weight of the individual shingles. The heavier the shingles, the more bundles will be needed to cover a square, since the individual bundles are meant to be light enough to be carried. In general, the heavier the shingles, the better the quality.