⚡ Free Tool
Roof Pitch Calculator
Calculate pitch angle, roof rise, rafter length and area multiplier
Calculate from Rise & Run
inches
inches
Roof Area (optional)
Common Roof Pitches
| Pitch | Angle | Multiplier | Description |
|---|---|---|---|
| 2:12 | 9.5° | 1.014 | Low / flat |
| 3:12 | 14.0° | 1.031 | Low slope |
| 4:12 | 18.4° | 1.054 | Common residential |
| 6:12 | 26.6° | 1.118 | Standard residential |
| 8:12 | 33.7° | 1.202 | Steep residential |
| 12:12 | 45.0° | 1.414 | Very steep |
