Calculate the number of trusses required and determine the geometry for a gable roof truss system.
Building Dimensions
Truss Specifications
Enter dimensions to calculate truss requirements
About this calculator
Overview
A roof truss is a pre-engineered structural framework designed to support the roof. This calculator estimated the quantity of trusses for a simple gable roof and provides key dimensions for planning.
💡
Pro Tips
Always order one extra truss to account for specialized gable end trusses.
Verify your local snow and wind load requirements with your supplier.
Consider the overhang distance when calculating the total rafter (top chord) length.
!
Fun Facts
"Standard residential trusses are usually spaced at 24 inches on center."
"Prefabricated trusses can save up to 25% on labor costs compared to traditional stick framing."
"A truss 'span' is the total width from one outside wall to the opposite outside wall."
Formula: Number of Trusses = ceil(Building Length / Spacing) + 1
Height = (Span / 2) × (Pitch / 12)
