Slope Factor Calculator

Calculate slope multiplier to convert flat area to actual roof surface area.

Angle of incline, often as ratio or percentage.
:12
Surface area measurement (length × width for rectangles).
sq ft

Results

Slope Factor:
Calculated slope factor based on your inputs.
-
Actual Roof Area:
Calculated surface area.
-sq ft
Area Increase:
Calculated surface area.
-%
Reference: Industry Standards. Pythagorean theorem applied to roof geometry.