Roof Pitch Calculator
Roof pitch calculator: pitch in x/12, angle in degrees and slope in %, from rise and run, plus rafter length and true roof area.
pitch = riserun × 12 · θ = atan(riserun)
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
Pitch = rise per 12 units of run. The roof area equals the footprint × √(1 + (rise/run)²). One roofing square is 100 ft².
Frequently asked questions
6 inches of rise per 12 of run?
6/12 pitch = 26.57°, 50 % slope; rafter factor 1.118.
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