It depends on the brand and type but conventional shingles of a good grade would be about 225 lbs.
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ruffly 5000LBS at 250 a square for 3tab shingles can be a little less or more depending on maker of shingles
100 sq ft = 1 square.
A square is 10x10 but now you need to know how many bundles it takes to do a square and that I'm not sure about
100 sq ft = 1 square.
255