Roof Pitch Calculator
Calculate roof pitch, slope, angle, and rafter length for your roofing project.
Enter Roof Dimensions
Vertical rise per 12 inches of horizontal run
Results
Enter rise and run above to calculate your roof pitch.
Common Roof Pitches Reference
| Pitch | Angle | Description |
|---|---|---|
| 2:12 | 9.5° | Low slope — flat roofs, sheds |
| 3:12 | 14° | Low slope — porch roofs, awnings |
| 4:12 | 18.4° | Conventional — standard residential |
| 5:12 | 22.6° | Conventional — cape cod, ranches |
| 6:12 | 26.6° | Conventional — most homes |
| 7:12 | 30.3° | Medium slope — colonial, victorian |
| 8:12 | 33.7° | Medium slope — steep enough for snow shed |
| 9:12 | 36.9° | Medium slope — tudor, gothic |
| 10:12 | 39.8° | Steep slope — dramatic look |
| 12:12 | 45° | Steep slope — walkable with care |
How to Use This Calculator
- 1Rise — Enter how many inches the roof rises vertically for every 12 inches of horizontal run. For example, a 6:12 pitch means 6 inches of rise.
- 2Run — Enter the horizontal span (half the building width for a symmetrical roof) in feet.
- 3Click Calculate to see your roof pitch ratio, angle in degrees, slope percentage, and rafter length.
Related Guides
This calculator provides estimates only. Actual materials needed may vary based on specific project conditions. Always consult a professional for critical projects.