Architect Tools

Roofing · Calculator

Roof Truss Calculator

Estimate basic chord lengths for a symmetric triangular roof truss.

Project inputs

Enter your project values, then press Calculate.

How this calculator works

Estimate basic chord lengths for a symmetric triangular roof truss.

top chord = √[(span/2)² + rise²]

How to use the Roof Truss Calculator

1. Enter project inputs

  • Truss span (m)
  • Truss rise (m)
  • Number of trusses (pcs)

2. Review the results

  • Top chord each side
  • Bottom chord
  • Chord length per truss
  • Total chord length

3. Check the calculation

The calculator uses the following core relationship:

top chord = √[(span/2)² + rise²]

Design note: This tool is intended for preliminary engineering checks, not final structural design or code compliance.

Roof Truss Calculator FAQ

What does the Roof Truss Calculator calculate?

Estimate basic chord lengths for a symmetric triangular roof truss.

What information do I need to use the Roof Truss Calculator?

The calculator uses inputs such as Truss span (m), Truss rise (m), and Number of trusses (pcs). Use values from your drawings, measurements, product data, or project specifications.

How should I use the results from the Roof Truss Calculator?

Use outputs such as Top chord each side, Bottom chord, Chord length per truss, and Total chord length for preliminary checking and comparison only. Final structural design, member selection, detailing, and code compliance should be verified by a qualified engineer using the applicable standards.