Roof pitch
calculator.
Type the rise per 12, the rise and run, or the angle. Get the pitch, the angle in degrees, the percent grade and the pitch multiplier.
Your roof
Results
- Pitch
- —Pitch = rise per 12 inches of run
- Angle
- —Angle = arctan(rise ÷ 12)
- Percent grade
- —Grade = rise ÷ 12 × 100
- Pitch multiplier
- —Multiplier = √(1 + (rise ÷ 12)²). Footprint × multiplier = roof area.
How roof pitch works
Rise over 12
Pitch is how many inches a roof rises for every 12 inches it runs across. A 6/12 roof rises 6 inches per foot.
Angle and grade
Angle = arctan(rise ÷ 12). Percent grade = rise ÷ 12 × 100. A 12/12 roof is 45° and a 100% grade.
The multiplier
Multiplier = √(1 + (rise ÷ 12)²). Multiply the flat footprint by it to get the sloped roof area.
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