The Truss and Rafter Calculator has 12 functions and data items for calculating the number, length and angles associated with trusses and rafters.

Truss and Rafter Calculators

• Trusses Needed for Roof: Computes the number of roof trusses needed for a roof based on the ridge length and the spacing between trusses.
• Pole Barn Materials: Estimates the amount of lumber and other materials needed to build a pole barn including the number of trusses needed.
• Trusses for Shed Roof: Computes the total number and length of trusses for a single sloped roof based on the span, ridge length and the front and back overhangs.
• Rafters for Gable Roof: Computes the total number of rafter boards (roof joists) for a gabled roof based on the ridge length, pitch and span.  It also returns the length of the ridge board, and the length and number of rafter ties and collar ties.
• Rafter Length: Computes the length of the rafters based on the span, pitch and overhang.
• Gambrel Rafter Lengths. This computes the upper and lower rafter lengths, attic width and total height under a gambrel roof based on the upper and lower pitch, span and loft height.
• Gable Roof Geometries: This computes the lengths and measurements for a gabled roof based on the ridge length, pitch, span and overhang.
• Dormer Geometries: This computes the measurements for a gable dormer based on the dimension of the dormer and main roof..
• Hip Roof Geometries: This the metrics associated with a hip roof based on the dimensions.
• Double Hip Roof Geometries: This compute the lengths of the dimensional lines where one hip roof intersects another such as in a dormer.
• Pyramid Hip Roof Geometries: This computes the lengths and dimensional lines of a pyramid roof.