3/6/2023 0 Comments Rafter size calculator![]() 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. the rafter member will be longer.To use the roof pitch calculator, identify and input the rise and run, and press ‘calculate’. Note that this is not the actual length of the roof rafter. It will goes up when span is increases or will goes down if span is decreases. Here you have given roof pitch = 3/12 and span of about 30 feet, then run = span/2, hence run = 30/2 = 15 feet, you know pitch = rise/run, so 3/12 or 1/4 = rise/run, hence rise = run/4, putting the value of run you get rise = 15/4 = 3.75 feet.ĩ/12 roof pitch rafter length | How long is a 9/12 pitch roofĨ/12 roof pitch rafter length | How long is a 8/12 pitch roofħ/12 roof pitch rafter length | How long is a 7/12 pitch roofĦ/12 roof pitch rafter length | How long is a 6/12 pitch roofĥ/12 roof pitch rafter length | How long is a 5/12 pitch roofĤ/12 roof pitch rafter length | How long is a 4/12 pitch roofģ/12 roof pitch rafter length | How long is a 3/12 pitch roofĬalculate the roof rafter length for 3/12 pitch, as Rafter^2 = rise^2 + run^2, Rafter^2 = 3.75^2 + 15^2, Rafter^2 = 14+225, rafter = √239, Rafter = 15.46 feet or 4.712 meters, hence rafter length for 3/12 pitch roof will be 15.46 feet long.ģ/12 or “3 in 12” roof pitch or slope, generally roof rafter length will be 15.46 feet or 4.712m long for 30 feet span.
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