Calculate common rafter length, total rise, slope factor, and bird's mouth cut depth for any roof pitch.
📐 Rafter Calculator
Rafter Run (ft)
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Rafter Rise (ft)
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Rafter Cut Length (ft)
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💡 Pro Tip
When cutting rafter bird's mouth joints, never cut more than 1/3 of the depth of the rafter out. Over-cutting weakens the structural integrity of the roof frame.
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Frequently Asked Questions
Q: How do you calculate rafter length?
Formula: Rafter Length = √((Run)² + (Rise)²). Add the eave overhang length to this measurement for the final rafter cut.
Q: What is roof run in framing?
The run is exactly half of the total span of the building (minus half the thickness of the ridge board).
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