Rafter length = run / cos(pitch angle); rafter count = ceil(building length ft x 12 / spacing in) + 1, at standard 16 in or 24 in OC.
Inputs
Results
Rafter length = run / cos(pitch angle); rafter count = ceil(building length ft x 12 / spacing in) + 1, at standard 16 in or 24 in OC.
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Trin-for-trin-guide
Enter Run and Rise
Input the horizontal rafter run in feet and roof rise in inches per 12 in of run.
Set Building Length & Spacing
Enter building length and choose 16 in or 24 in OC rafter spacing.
View Rafter Count & Length
Get the number of rafters needed and the length to cut each one.
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