📏 Rafter Calculator
Roof span, pitch and length
Building width (span)
Roof pitch
(rise per 12 of run)
Building length
Eave overhang
Rafter spacing
12 in on center
16 in on center
24 in on center
Ridge
2× ridge board (1.5 in thick)
Ridge beam / no deduction
Calculate rafters
Calculator by
CalcCoverage
— free DIY & home-improvement calculators