To calculate the rise, measure from a horizontal line running from supporting top plate to supporting top plate, vertically at a right angle up to the peak or top of the ridge board. It is a ratio comparing the rise of the roof to the span. The span is the distance from the outside face of one supporting wall to the outside face of the other supporting wall. The rise is measured from the top of the horizontal line running between supporting walls vertically at a right angle up to the roof’s peak or ridge board top. The pitch of the roof is a ratio or fraction comparing the rise of the roof to its span. The calculator contains the algorithms and accurately performs the computations, so you don’t have to do the math. Determine how many inches the roof rises per foot using the pitch and insert the values in the rise and run fields and calculate the rafter length (without overhang). If you don’t know the rise and run but you know the pitch degree or percentage, input that value in the correct field of the calculator to determine the pitch ratio or fraction. The pitch may be expressed as a fraction or a ratio, such as x/12, or as a percentage or degree. If you know the roof pitch, which is the rise of the roof compared to its span, it can be used to determine the rise and run. The higher the rise, the greater the roof pitch, and the longer the rafter. The rise and run determine the pitch of the roof. To use the roof pitch calculator, identify and input the rise and run, and press ‘calculate’.
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