each bundle does 33.3 sq ft.
9 if you are using 3 tab shingles.
7
4 bundles
How many bundles of 3-Tab Shingles are needed to cover 80 square feet?
9 bundles assuming std. 3 bundle/sq. shingles
54
8 bundles
How much area would 15 bundles of shingles cover. Standard duty shingles use 3 bundles for every 100 square feet so 15 bundles would cover 500 square feet.
73 bundles
A bundle of Shingles will cover roughly 33 square feet. A square of Shingles (3 Bundles) will cover 100 square feet.
3 bundles of shingles = 100 square feet 1 bundle of shingles = 33 1/3 square feet
If your shingles say they cover 3 bundles to a square ( 10'x10' or 100 sq. ft) then one and a half. Some thicker, heavier shingles are 4 bundles to a square so you'd need 2.
For 644 square, a square is 100 square feet. 3 bundles to a square so 3x644=1,932 bundles. I imagine your question is how many bundles for 644 square feet. That's 20 bundles plus 2 for the starter course and the cap so 22 total.
4 bundles of shingles covers 100sq.ft. of course this is approx. shingles come in several sizes and then you must allow for waste cuts etc