Roof Pitch Calculator
Find roof pitch, angle, and slope multiplier from rise and run.
Enter the rise and run of your roof to get the pitch expressed as X-in-12, the roof angle in degrees, and the slope multiplier used to convert a flat footprint into actual sloped roof area.
How it works
Pitch is rise per 12 inches of horizontal run. The angle is the arctangent of rise over run. The slope multiplier is √(rise² + run²) ÷ run — multiply your roof's flat footprint by it to get the true sloped area for the roofing calculator.
Frequently asked questions
How do I calculate roof pitch?
Pitch is the rise in inches for every 12 inches of horizontal run. A roof that rises 6 inches over 12 inches of run is a 6:12 pitch.
What is the angle of a 6:12 roof?
About 26.6 degrees. The angle is the arctangent of rise divided by run.
What is the slope multiplier for?
Multiply your roof's flat footprint area by the slope multiplier to get the actual sloped surface area — the number you feed into a shingle estimate.
Is this calculator free and private?
Yes. Every CubicCabin calculator runs entirely in your browser, so the numbers you enter are never uploaded or stored. There's no sign-up, no limits, and it keeps working even if you lose connection after the page loads.