Roof Pitch Calculator
Worked example result
| Pitch (per 12) | 6.00 |
| Pitch notation | 6 / 12 |
| Angle | 26.57 ° |
| Slope | 50.0 % |
| Rafter length per 12 in of run | 13.42 in |
| Slope multiplier (area factor) | 1.118 |
A rise of 6 over a run of 12 is a 6/12 pitch: a 26.57° angle, a 50% slope, 13.42 inches of rafter for every 12 inches of run, and a 1.118 area multiplier.
Pitch = (Rise ÷ Run) × 12; Angle = atan(Rise ÷ Run); Rafter per 12 run = √(12² + Pitch²); Multiplier = Rafter ÷ Run · Powered by CalcHub — Roof Pitch Calculator