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Rafter Angle Calculator
This calculator will give you the angles and lengths needed for hand framing your roof. When asked for decimal feet input values such as 12.5 for 12'-6". The Hip Roof checkbox is not functional at this time so the calculator will output all values. I will draw some pictures for the output values so people will know what each output angle or length represents. Input values as stated.

Input Values

Roof Pitch  /12
Nominal Ridge Width (decimal inches)  inches
Plan Distance (decimal feet)  Feet
Eave Overhang (decimal feet)  Feet

Output Values

Rafter Length  Feet
Hip Rafter Length  Feet
Length to birdsmouth from peak (hip)  Feet
Length to birdsmouth from heel (hip)  Feet
Common Rafter Miter Angle  °
Hip Rafter Bevel Angle  °
Hip Rafter Miter Angle  °