Roof Truss Calculator

Calculate number of roof trusses and costs.

It's simple to calculate the amount of trusses needed for your roof with our online calculator. Once you know the length of your roof and on-center spacing of the trusses you're good to go!

We also have a rafter length calculator if you're looking for more truss dimensions.

Calculate Truss Amount & Costs

roof truss count calculator
Default is 60cm or its equivalent in feet.

How to Use

  1. Measurement Units: Choose either meters or feet.
  2. Roof Length: the length of the roof for which you are calculating the truss count.
  3. On-Center Spacing: the center-to-center distance between trusses. The default value is 60 cm.
  4. Price per Truss (optional): estimate the total cost of the trusses.
  5. Calculate: Press the "Calculate" button to see how many trusses you will need and the total estimated cost for your project.

Note: This calculator assumes a simple gable roof for the purpose of these calculations.

Calculator checked on By Jamie

Uses

  • Residential: determine the number of trusses needed for new homes or additions.
  • Commercial: estimate truss requirements for larger roofs.
  • Agricultural: calculate truss counts for barns, sheds, and other agricultural buildings.
  • Renovation and Repair: assess the number of new trusses needed when repairing or renovating existing roofs.
  • Architectural Design: Architects can integrate precise truss counts into their designs.
  • Cost Estimation: Get an early estimate of the cost associated with the roof structure.