Shed Roof Rafter Span Calculator

The preview window displays a dimensioned side view of the shed roof.

Shed roof rafter span calculator.

The run for a lean to shed rafter ending into a wall should account for the ridge board nailed into the wall where the tops of the rafters rest into. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Also available for the android os. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof.

Rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle. Span calculator for wood joists and rafters also available for the android os. Click the button to calculate the stock size needed for this job. In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2.