Free Roof Truss Calculator
Calculate Number of Roof Trusses Needed
Standard: 24″ OC
📋 Truss Spacing Guide
- 24″ OC: Standard residential
- 16″ OC: Heavy snow/tile roofs
- 48″ OC: Pole barns with metal
❓ Roof Truss FAQ
How many roof trusses do I need?
(L × 12 ÷ S) + 1. Trusses = (L × 12 ÷ S) + 1. 40ft at 24\” = 21 trusses.
What is standard truss spacing?
24\” OC standard. 16\” heavy. 48\” pole barns.
How much do roof trusses cost?
$150-$400 each. 40ft building: $4,200-$6,300 for 21 trusses.
Free Forever
No hidden costs
No Sign-up
Instant access
Mobile Friendly
Works on all devices
Instant Results
Calculate in seconds