Rafter Calculator
Calculate the length of rafters for a pitched roof given the span, pitch, and overhang.
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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.
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Frequently Asked Questions
A rafter is a structural component that runs from the ridge of a roof to the wall plate, supporting the roof covering.
Rafter length is calculated using the Pythagorean theorem: L = (span/2 + overhang) × √(1 + (pitch/12)²), where span is the building width, pitch is the rise per 12 inches of run.
This calculator uses feet for all measurements. The roof pitch is expressed as inches of rise per 12 inches of run (e.g., 6 for a 6/12 pitch).
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