Truss and Rafter Calculator

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.