Rafter Length Calculator
Calculate the length of a rafter given the span, overhang, and pitch (slope). Perfect for roof framing projects.
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional static calculators, our tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
Previous Results
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Frequently Asked Questions
A rafter is a structural beam that extends from the ridge of a roof to the wall plate, supporting the roof covering.
Rafter length is calculated using the formula: (span/2 + overhang) / cos(arctan(pitch/12)), where pitch is the rise per 12 inches of run.
The calculator supports feet and meters. You can select the unit from the dropdown menu.
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