HIP ROOF GEOMETRY

Hip Roof Calculator

Calculate symmetrical rectangular hip roof surface area, hip rafter lengths, common rafters, and ridge line dimensions.

Building Length

Building Width / Span

Roof Pitch (X/12)

/ 12

Eave Overhang (All 4 Sides)

inches

$$text{Sloped Surface Area} = text{Adjusted Footprint} times sqrt{1 + left(frac{X}{12}right)^2}$$

$$text{Hip Rafter Length} = sqrt{2 times text{Half-Span}^2 + text{Rise}^2}, quad text{Ridge Length} = text{Length} – text{Width}$$

A 4-sided hip roof features 2 triangular ends and 2 trapezoidal sides that slope upward to a central ridge board.