Divide by (14400*2.54^2).
Algebraic Steps / Dimensional Analysis Formula ____ mm²*1 cm²
100 mm²*1 in²
6.4516 cm²*1 ft²
144 in²=? ft²
Direct Conversion Formula ____ mm²*1 ft²
92903.04 mm²=? ft²
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A "square" of shingles is 10 ft x 10 ft totaling 100 sq ft. So, the amount you will need would be 60ft x 30ft = 1800 sq ft/100 sq ft = 18 sq Good luck.
Average price in Southeast is $3 - $4 per sq ft for stone tile like travertine
If a 412 pitch means a one third pitch then 20% needs to be added on to the area to be covered. So, for a 40ft x 60ft building, the total area to be covered is 40x60 = 2400 sq ft. Adding 20% or 480 sq ft this comes to 2880 sq ft. Next work out the area of the plywood sheets. Lets say 10ft x 5ft or 50 sq ft. So the total number of sheets is total area needed divided by the area of the sheets. That works out to 2880/50 = 57.6 or 58 sheets. A useful table for working out the area of a roof for various pitches is at the web link below.
When talking about the area of a roof, remember that it is not the same as the square footage of the structure. For example a 20 x 30' building with a 12" overhang and a 4/12 pitch will have 736 sq ft of roof vs only 600 sq ft of slab. One square of shingles covers 100 square feet. 15 year shingles come 3 bundles to a square. 25 year come 4 bundles to a square.
An acre is 43,560 sq feet. Your 100 x 150 lot is 15,000 sq ft.- A bit more than 1/3rd of one acre- it is 0.344 acres.