Roof Rafter Calculator | Estimate Length And Cost Of Rafters

In this article we are going to explain how to calculate rafters for your roof – estimate rafter length, board size, Quantity, cost per board and total cost of lumber with  Roof Rafter Calculator. Depending on the foot print (length and width) of your home and roof slope, the calculator can perfectly compute all Rafters and Ridge boards.
Here are a few guidelines on how to use rafter calculator :
1) Enter house footprint: Length is specified in the roof eave (gutter) side. Width or Span is specified in the gable side of the roof that is useful for working out rafter length and cost.
2) Enter overhang length: Most houses contain overhangs (soffits) to safeguard the house exterior walls and foundation from water overflow from the roof. Provide preferred overhang length – it will impact your rafter length and lumber required for the job.
3) Put in roof pitch / slope: Roof pitch refers to the value of roof rise over roof run, applying 12 as the base for roof run. As for instance, if your roof gets higher 5″ for every 12″ of run, provide 5 as roof pitch. If your roof pitch remains in degrees, the roof pitch calc can transform degrees to “pitch” value.
4) Choose rafter spacing and width:
Rafter spacing (and roof length) are applied to find out the quantity of rafters required for your project.
Lumber size/ width (2×8″, 2×10″ or 2×12″ boards) should have been utilized to calculate cost of each rafter along with the total cost (irrespective of local sales tax

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