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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.
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 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.
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.
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.
This calculator provides an efficient way to compute common rafter length, aiding in proper roof construction and ensuring the overall stability of a building’s roof system.
Rafter Calculator estimates the length, board size, quantity, cost per board and total cost of lumber. The estimates are based on your house foot print (length and width) and roof slope. Rafter prices are based on quotes from multiple lumber yards and building material suppliers.
For the Basic Calculator, simply enter the rafter run (in feet) and the angle of the rafter (in degrees) to find the rafter length. For a more detailed calculation, use the Advanced Calculator. Enter the total run, total rise, and pitch to get the total rafter length.
Ensure your roof trusses are the correct dimensions with our online rafter length calculator. Enter some simple measurements for accurate results.
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.