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.. How to calculate the length of common rafters. this page explains how to calculate, set-out and cut common rafter lengths used in a gable roof.. unless you want to just leave them long and pull a string line through and cut the tails off later there are two quick calculations to determine the two lengths as shown in the picture above. one for the actual length from plate to ridge, the other. Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width, selecting a pitch for the roof, and the thickness of the ridge..
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.. The roof pitch calculator calculates slope, pitch, angle and rafter lengths, based on input of rise (m) and run (r). use the diagrams on this page as a reference when inputting rise and run, and while interpreting the calculated results. angle - the angle of a roof is the same as the roof's slope. Allow for ridge thickness when determining rafter run to outer wall. eg: half building width minus 1/2 ridge thickness. see rafter run to outer wall calculator below..
