Roof Truss Calculator

Calculate the number of trusses required and determine the geometry for a gable roof truss system.

Building Dimensions

Building Length (ft) (ft)

Building Span (ft) (ft)

Roof Pitch (x in 12)

Truss Spacing (in) (in)

Truss Specifications

Enter dimensions to calculate truss requirements

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.

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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)

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