The Hip Roof Calculator has equations and data useful for computing dimensions and materials for a hip roof.
The functions include:
A Hip Roof is similar to a basic gable roof, except it has sloped sides (hips) creating triangular ends to the roof and trapezoids faces on the front and back. A basic hip roof has four faces which are all exposed to rain and snow from above and require roofing material. A Full Hip Roof is defined by the span, length, pitch and overhang, where the angles of the hips are also the same as the pitch. These calculators compute the area, ridge lengths and materials required for a basic hip roof.
A hip roof is geometrically a trapezoid pyramid. Based on the length, span and the pitch, the measurements of the surface area, hip lengths and ridge can be computed.
The intersection of two hip roofs is a common configuration (left).
Metal roofs are also common on hip roofs. For these, it is important to have a solid material to which the metal panels are screwed. This typically requires purlins, horizontal boards attached to the roof.