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Calculate roof pitch from rise and run, convert between pitch and angle, and determine the pitch multiplier for roofing material calculations.
Vertical height
Horizontal distance (usually 12)
Flat - Requires special flat roof membranes
Requires special flat roof membranes
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| Pitch | Angle | Multiplier | Type |
|---|---|---|---|
| 2/12 | 9.46° | 1.014 | Low slope |
| 4/12 | 18.43° | 1.054 | Medium |
| 6/12 | 26.57° | 1.118 | Medium |
| 8/12 | 33.69° | 1.202 | Medium |
| 10/12 | 39.81° | 1.302 | Steep |
| 12/12 | 45.00° | 1.414 | Steep |