100
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You can't convert that. You can convert from one linear unit to another linear unit, or from one square unit to another square unit, but not between linear units and square units.
One square = 100 sq ft of roof area.
Square feet measure area and linear feet measure length. If a board is one (linear) foot long, that does not tell you how much area it covers, unless you also know the width.
None.Square feet are a measure of area;Linear yards are a measure of lengthand have no width.Area is length times widtharea_of_linear_yard = 1 linear yard x 0 linear yard= 0 square yards= 0 square feet
27 squares is equivalent to 2700 square feet. Measure square area by multiplying length by width of your entire roof. Add all the areas together for total square feet. Take the square feet and divide by 100 to get squares. 3 bundles of shingles to make one square with 5 inches of exposure on the shingles. For every 33 feet of ridge you will need one bundle of three tab shingles. Each bundle of shingles has 27 shingles so that is 81 single tabs at approximately 5 inches each, 405 inches of run or 33.75 linear feet. At current shingle prices near $21 per bundle that will cost you about $1700 just in shingles. #15 roll of felt is 4 squares at about $20 per roll. One box of coil nails will usually cover 18-20 squares. Any other calculations and you are on your own.