Rafter Length Calculator

Calculate the Rafter length with our free online tool using the input parameters: Overhang, Roof Span, Pitch, Angle

Easily calculate the length of a shed roof rafter for your building or structure using our convenient online rafter length calculator. The rafter, which supports the building, can be accurately determined with this tool.

Calculate using
Roof Span
Rafter Length
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    1 Number of calculations

    Rafter\ Length\ using\ Angle = V + \frac{R}{2\cos(A)}
    Rafter\ Length\ using\ Pitch = V + \frac{R}{2}\sqrt{1+P^2}

    The variables used in the formula are:

    V = Overhang

    R = Roof Span

    P = Pitch

    Easily calculate the length of your shed roof rafter with our online Rafter Length Calculator. Just enter the measurements of the overhead, length of roof span, and pitch or angle, and you’ll have the rafters of the perfect size for your roofing project.