🏗️ Truss Calculator
Calculate roof truss dimensions, material requirements, and costs
Truss Specifications
Truss Types Guide
King Post
Simplest truss design with a single vertical post. Best for spans up to 25 feet. Economical and easy to build.
Queen Post
Two vertical posts connected by a horizontal straining beam. Good for spans 25-40 feet. Creates usable attic space.
Fink (W-Truss)
Most common residential truss with W-shaped web. Efficient material use, suitable for spans up to 40 feet.
Howe
Vertical posts with diagonal braces sloping toward the center. Good for heavy loads and larger spans up to 60 feet.
Roof Pitch Reference
| Pitch | Angle | Use |
|---|---|---|
| 2:12 | 9.5° | Minimum for shingles |
| 4:12 | 18.4° | Most roofing materials |
| 6:12 | 26.6° | Standard residential |
| 8:12 | 33.7° | Steep, good drainage |
| 12:12 | 45° | Very steep, snow areas |
Spacing Guidelines
| Spacing | Load | Application |
|---|---|---|
| 16" OC | Heavy | Snow loads, tile roofs |
| 24" OC | Standard | Most residential |
| 32" OC | Light | Sheds, low-load areas |
⚠️ Important Disclaimer
This calculator provides estimates for planning purposes only. Roof truss design requires professional engineering analysis to account for local building codes, snow loads, wind loads, seismic requirements, and specific material properties. Always consult a licensed structural engineer before construction and obtain necessary permits. Pre-engineered trusses from manufacturers are recommended for most applications.
About Truss Calculator - Roof Truss Dimensions & Materials
Calculate roof truss dimensions, lumber requirements, and costs. Plan king post, queen post, fink, or howe trusses.
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