Roof Pitch Calculator
Pitch, angle, rafter length and roof area.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Pitch
- 6/12
- Angle
- 26.57°
- Rafter length
- 16.77 ft
- Total roof area
- 1342 sq ft
- Shingle squares
- 13.4
Working
- 1angle = arctan(6 ÷ 12) = 26.57°
Quick answer
Roof pitch is rise per 12 inches of run; a 6/12 pitch is 26.57 degrees.
angle = arctan(rise ÷ run)
How to use the Roof Pitch Calculator
- 1Enter the rise per 12 inches of run.
- 2Enter the run (half the building span).
- 3Add the roof length for area and shingles.
Frequently asked questions
What is a walkable pitch?
Up to about 6/12 most roofers walk comfortably; 8/12 and above needs roof jacks and harnesses.
What is a shingle square?
100 square feet of roof surface — the standard unit shingles are sold in, usually three bundles per square.