Roof Truss Calculator
Result
Roof Truss Calculator — free online calculator.
Formula
- Roof Truss Calculator calculates its result from Roof Span (width), Pitch Angle, Truss Spacing, Roof Length. It uses the formula PeakHeight = (Span/2)×tan(Pitch); Rafter = (Span/2)/cos(Pitch); Trusses = ceil(Length/Spacing)+1. Change any input to recalculate the result instantly.
- The main inputs are Roof Span, Pitch Angle, Truss Spacing, Roof Length. Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Roof Truss
- Roof Span: 8 width
- Pitch Angle: 30
- Truss Spacing: 0.6
- Roof Length: 12
Using Roof Span (width) = 8, Pitch Angle = 30, Truss Spacing = 0.6, Roof Length = 12, the calculated result is 21.
Sample result: Calculating…
Frequently asked questions
What does the Roof Truss calculate?
Roof Truss Calculator — free online calculator.
Which values should I enter?
Enter Roof Span, Pitch Angle, Truss Spacing, Roof Length using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: PeakHeight = (Span/2)×tan(Pitch); Rafter = (Span/2)/cos(Pitch); Trusses = ceil(Length/Spacing)+1.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.