The preview window displays a dimensioned side view of the shed roof.
Shed roof rafter span calculator.
Input the rafter span on the flat eave overhang and pitch of the roof.
Click the button to calculate the stock size needed for this job.
To calculate a shed roof select shed from the roof type dropdown list or click on the corresponding button on the toolbar to calculate a shed 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.
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.
Span calculator for wood joists and rafters also available for the android os.
This calculator is to be used as an estimating tool only.
Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.