Calculate roof coverage and material needs for shingle projects with waste considerations.
Overview
Roofing estimates require slope-adjusted area rather than just building footprint.
This calculator helps convert dimensions into shingle squares and bundle counts.
Include waste factors for cuts, valleys, and ridge complexity.
Steps
Input base length and width or section dimensions.
Adjust area for roof slope.
Get slope-corrected coverage area.
One roofing square equals 100 square feet.
Increase quantity for cuts and installation loss.
Math
Slope Area = Footprint Area * Pitch Factor
Roof pitch increases actual surface area relative to horizontal footprint.
Worked cases
1800*1.12
Roof area 2016 sq ft
2016/100
20.16 squares
20.16*1.12
About 22.58 squares
Why use this
Questions