Roof Pitch Calculator

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Calculates the rafter length and roof slope based on the roof pitch and run.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Roof Pitch (inches per foot) and Roof Run (horizontal distance, in feet) in the units shown.

Step 2

Read Roof Slope (degrees) and Rafter Length (feet) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Roof Pitch (inches per foot): 6 inches/foot; Roof Run (horizontal distance, in feet): 10 ft

Roof Slope (degrees): 26.56505118 degrees; Rafter Length (feet): 11.18033989 ft

Roof Pitch (inches per foot): 8 inches/foot; Roof Run (horizontal distance, in feet): 15 ft

Roof Slope (degrees): 33.69006753 degrees; Rafter Length (feet): 18.02775638 ft

Roof Pitch (inches per foot): 4 inches/foot; Roof Run (horizontal distance, in feet): 12 ft

Roof Slope (degrees): 18.43494882 degrees; Rafter Length (feet): 12.64911064 ft

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