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Use our rafter length calculator to see how long your rafters need to be when framing a roof or truss. Plus, learn the rafter length formula.
Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. The calculation includes results for hip/valley factor, slope factor and the roof slope in degrees.
Input the roof length and the on-center spacing (the distance between the middles of two neighboring roof trusses), and the rafter calculator will return the number of roof trusses needed. Our tool can also figure out the approximate roof truss cost.
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. The results are automatically fired.
Easily calculate rafter length with our free roof rafter length calculator. Access rafter length tables, including birdsmouth and 4/12 pitch calculations.
Roof Pitch Calculator. The roof pitch calculator calculates rise, run, slope, pitch, angle, and rafter length. Use the diagrams on this page when referring to the Input section and to interpret the calculated Results.
Ensure your roof trusses are the correct dimensions with our online rafter length calculator. Enter some simple measurements for accurate results.
The emergence of calculators has simplified this process, allowing for quick and accurate calculations for any roof configuration. The common rafter length is derived from the Pythagorean theorem, as the roof forms a right triangle. The formula is: \ [ \text {Rafter Length} = \sqrt {\left (\frac {\text {Span}} {2}\right)^2 + \left (\frac {\text ...
It helps you determine the precise length of rafters needed for a specific roofing project. By inputting key measurements and angles, the calculator provides accurate rafter lengths, ensuring your roof is perfectly constructed and structurally sound.
Rafter Length Calculator – based on roof rise. Enter the rise and run of the roof to calculate the rafter length: Rise (m): Run (m): Rafter Length (m):