Free roof pitch calculator
Convert roof pitch into angle and area multiplier
Enter the vertical rise for every 12 inches of horizontal run. The calculator returns the slope angle and multiplier used to convert horizontal footprint into sloped surface area.
Live calculation
Roof pitch result
- Pitch
- 6 / 12
- Slope angle
- 26.6°
- Area multiplier
- 1.118
Planning estimate only. Verify field measurements, product coverage, bundle packaging, waste, starter, ridge cap, local code, and manufacturer instructions before purchasing.
Need a measured roof, not another calculation?
Order a $19 human-reviewed residential roof measurement report. Typical turnaround is about one working hour for straightforward homes with usable imagery.
Questions
What does 6/12 roof pitch mean?
The roof rises 6 inches for every 12 inches of horizontal run.
How is the angle calculated?
The angle is arctangent of rise divided by run, converted from radians to degrees.
Does pitch alone give total roof area?
No. You still need the horizontal footprint or measured roof-plane geometry.