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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.
Roof pitch calculator - Use this calculator to calculate roof slope, roof pitch, and common rafter length.
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.
The Rafter Length Calculator is a tool designed to help you determine the dimensions of a rafter based on specified inputs. This step-by-step guide will walk you through using this calculator efficiently. Ensure that you have all the necessary measurements ready before starting.
Ensure your roof trusses are the correct dimensions with our online rafter length calculator. Enter some simple measurements for accurate results.
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):
This rafter calculator allows you to calculate the rafter length, roof pitch, and overall rafter span for your construction project. Here’s how to use it: Enter the Span of the roof in feet. Enter the Run of the roof in feet (typically half the span). Enter the Rise of the roof in feet. Click the “Calculate” button to get the rafter ...
Using a rafter length calculator saves time and prevents errors. Just input the span and pitch, and the calculator gives you the length instantly.