The all-in-one design tool
This is the full calculator: geometry, quantity, cost and loads from one set of inputs. Use it to size a roof before talking to a truss supplier or engineer.
Suggested workflow
- Set span, length, pitch and overhang.
- Choose roof type and spacing.
- Enter local snow and wind loads.
- Check results, print or export, and take them to your supplier.
Learn what drives the results in truss design principles, or use the simple truss calculator when you only need a quick answer.