Roof Pitch Calculator

The Roof Pitch Calculator helps determine roof slope, roof angle, rise, run, and rafter length for residential and commercial roofing projects. It is widely used by contractors, roofers, architects, engineers, and homeowners planning roof construction.

What Is Roof Pitch?

Roof pitch describes how steep a roof is. It is expressed as the number of inches a roof rises vertically for every 12 inches of horizontal run. For example, a 6/12 roof pitch rises 6 inches for every 12 inches of run.

How To Use

Enter roof rise.
Enter roof run.
Enter building span.
Enter roof overhang.
Click Calculate.
Review pitch, angle, slope, and rafter length.

Formula Used

Roof Pitch = (Rise ÷ Run) × 12

Roof Angle = arctan(Rise ÷ Run)

Slope (%) = (Rise ÷ Run) × 100

Rafter Length = √(Run² + Rise²)

Common Roof Pitches

Pitch	Angle
4/12	18.4°
6/12	26.6°
8/12	33.7°
10/12	39.8°
12/12	45°

Benefits

Accurate roof design calculations
Determine rafter lengths quickly
Improve material estimates
Useful for roof construction planning
Supports residential and commercial projects

Applications

Roof framing
Home construction
Roof replacement projects
Architectural design
Building inspections
Material estimation

Final Thoughts

A Roof Pitch Calculator simplifies roof design by calculating pitch, angle, slope, and rafter lengths instantly. It helps contractors and homeowners improve accuracy while reducing material waste and planning errors.

Roof Pitch Calculator | Roof Slope, Angle, Rise & Rafter Length Calculator