Roof Truss Calculator
Calculate roof truss dimensions, member lengths, and quantities. Supports king post, queen post, Fink, and Howe truss configurations.
Including tiles, battens, wind uplift
Including plasterboard, insulation
Enter truss parameters to calculate forces and sizes
IMPORTANT DISCLAIMER
This calculator provides PRELIMINARY ESTIMATES ONLY and is intended for planning and budgeting purposes. Results should NOT be used for final structural design or construction without verification by a licensed Professional Engineer (PE) or Chartered Engineer (CEng).
By using this tool, you acknowledge that:
1. All calculations are indicative and may not account for site-specific conditions, load combinations, or local code requirements.
About This Calculator
This roof truss calculator helps engineers and contractors design timber or steel trusses for residential and commercial buildings across the UAE and Gulf. Calculate member lengths, angles, and material quantities for king post, queen post, Fink, Howe, and scissor truss configurations. Essential for villa projects and warehouse construction common in Gulf development.
When to Use This Calculator
- Designing roof structures for villas and residential buildings
- Calculating steel truss dimensions for warehouse projects
- Estimating timber quantities for traditional roof construction
- Determining rafter lengths and birdsmouth cuts
- Planning prefabricated truss orders for repetitive housing
How to Use This Calculator
Select truss type
Choose king post, queen post, Fink, Howe, or scissor configuration
Enter span and pitch
Input the building span and desired roof pitch angle or rise
Specify overhang
Add eave overhang distance for rain protection
Review member lengths
Get calculated lengths for rafters, ties, and web members
Generate material list
Obtain quantities for lumber or steel sections
Typical Scenarios in UAE & Gulf Projects
Designing scissor trusses for a 12m span villa with cathedral ceiling. 6:12 pitch provides aesthetic interior while allowing hidden MEP runs above. Calculator determines 14.4m rafter length with steel gusset plates at joints.
Steel Howe trusses spanning 24m for a logistics facility. 15° pitch for minimal visual impact while ensuring rainwater drainage. Calculator sizes bottom chord as 200x100 RHS with 100x100 SHS web members.
Frequently Asked Questions
Take Your Calculations Further
This calculator reflects the logic built into Arkan's construction management platform.
Last Updated: January 2026
Standards Reference: AISC Steel Construction Manual, Timber design per NDS/Eurocode 5