Roof Pitch Calculator
Calculate roof pitch in degrees and percentage from rise and run measurements. Determine roof type and rafter length.
Inputs
inches
inches
Results
Pitch Ratio
6/12
Pitch (Degrees)26.57°
Pitch (Percent)50%
Roof TypeConventional
Rafter Length (per foot of run)13.42 in
How to Use This Calculator
- Measure the vertical rise and horizontal run from your roof structure or blueprints.
- Enter the rise in inches — this is how many inches the roof rises over 12 inches of horizontal run.
- Enter the run in inches — standard pitch notation uses 12 inches as the run.
- Read the pitch ratio (e.g., 6/12), pitch in degrees, and roof classification (low slope, conventional, or steep).
- Use the rafter length output (inches per foot of run) to calculate total rafter lengths.
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