GABLE ROOF GEOMETRY

Gable Roof Calculator

Calculate dual-pitch gable roof slope length, total surface area, ridge length, and roof rise with eave and rake overhangs.

Building Length (Ridge Run)

Building Span (Total Width)

Roof Pitch (X/12)

/ 12

Eave Overhang (Inches)

inches

Gable Rake Overhang (Inches)

inches

$$text{Slope Length} = frac{text{Adjusted Span}}{2} times sqrt{1 + left(frac{X}{12}right)^2}$$

$$text{Total Surface Area} = 2 times (text{Adjusted Length} times text{Slope Length})$$

Gable roofs feature two sloping roof planes meeting at a central ridge, forming triangular wall sections at each gable end.