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. rise and run means that a 6/12 pitch roof has 6" of rise (vertical) for each foot of run (horizontal).. Pitched roof rafter lengths how to calculate the length of common rafters. once the wall plates are square and you have measured the span, you are ready to set-out and cut the common rafter lengths. these are used in almost every roof, including a gable end, lean to and hipped roof too.. Rafter tools+ is a rafter calculator for complex roof framing angles that other roof framing calculators don't offer. stair tangent for iphone this iphone app is for rough frame carpenters that don't build stairs everyday, but could use an stair app calculator to check their stair building calculations..
