Roof Truss Estimator — Quantity, Spacing & Ordering Guide
Get a fast truss order summary before you call the supplier. The calculator shows count, overall truss length, rise, roof area, approximate weight, and delivery notes.
Ordering checklist
- Confirm the exact span from outside bearing to outside bearing and include overhang requirements.
- Share site address, delivery restrictions, and target crane or forklift plan with the truss supplier.
- Spans over 28 ft often need crane handling or a clear site delivery path.
Important note
Truss engineering and stamped drawings are provided by the truss manufacturer — always use engineered drawings for fabrication, bracing, and installation.
Frequently Asked Questions
How many trusses do I need?
A fast rule is building length divided by truss spacing, then add one end truss. The calculator rounds that count up so the layout covers the building.
What span should I order?
This tool adds the building width plus both overhangs so the supplier sees the full truss width requirement.
Do I need stamped drawings?
Yes. Trusses are engineered products. Always build from the manufacturer’s sealed truss design package and bracing instructions.
Keep the project moving
Use the free calculator for fast takeoffs, then plug the result into a reusable field template.
Need templates? Browse our professional template store — contracts, checklists, and planners from $17.