Conversion
Roof pitch to percent grade
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Roof pitch as a percentage grade is the rise divided by the run, times 100. A 6/12 pitch is a 50% grade.
grade % = (rise ÷ 12) × 100. A 6/12 pitch = 50%; a 12/12 pitch = 100%.
Conversion table
| Pitch | Grade % | Degrees |
|---|---|---|
| 2/12 | 17% | 9.5° |
| 3/12 | 25% | 14.0° |
| 4/12 | 33% | 18.4° |
| 6/12 | 50% | 26.6° |
| 8/12 | 67% | 33.7° |
| 10/12 | 83% | 39.8° |
| 12/12 | 100% | 45.0° |
The formula
grade % = (rise ÷ run) × 100
Grade percent is the rise divided by the run, times 100 — a 6/12 pitch is a 50% grade. Convert any pitch on the pitch calculator.
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