Framing Tools

Rafter Length Calculator

Calculate common rafter, hip rafter, and jack rafter lengths for any roof pitch. Includes birdsmouth cuts, overhang, and lumber estimates.

Roof Specifications

Building Width (feet)

Building Length (feet)

Roof Pitch

Rafter Overhang (inches)

Rafter Type

Rafter Spacing

Birdsmouth Depth (inches)

Waste Factor (%)

Rafter Length 0 ft

                                Total Rafters
                                0
                                rafters
                            

Run (half width) 0 ft

Rise (roof height) 0 ft

Pitch Factor 1.12

Plumb Cut Angle 0°

Total Linear Feet 0 ft

Lumber Cost $0

Pitch Factor = √(12² + pitch²) ÷ 12

Rafter = Run × Factor + Overhang

Rise = Run × (pitch ÷ 12)

Angle = arctan(pitch ÷ 12)

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