Roof Shingles/Square Calculator
#Per Square =
Estimates the number of shingles needed per square (100 square feet) of roof area.
-Length: Length of the shingle.
-Exposure: Exposure of the shingle.
-#Per Square: Number of shingles per square.
Estimate the number of shingles you need per square (100 square feet) of roof area if you are using 3 tab asphalt shingles where the length of each is 36in and the exposure is 5in.
You need 80 shingles per square.