How roof pitch is calculated
Roof pitch compares vertical rise with horizontal run. To express any rise-and-run measurement as the common X:12 format, divide rise by run and multiply by 12.
Roof pitch example
A roof that rises 6 inches over a 12-inch horizontal run has a 6:12 pitch. Its roof angle is approximately 26.57 degrees.
Pitch, angle and slope percentage
These values describe the same roof slope in different ways. Pitch is commonly used in roofing, degrees describe the angle, and slope percentage expresses rise as a percentage of run.
Rise and run must use the same unit. Inches, centimeters or feet all work as long as both values use the same unit.
Frequently asked questions
What angle is a 6:12 roof pitch?
Approximately 26.57 degrees.
What does 4:12 roof pitch mean?
The roof rises 4 units vertically for every 12 units of horizontal run.
Is roof pitch the same as roof slope?
They describe the same incline, but pitch notation, angle and percentage express it differently.
Can I enter a run other than 12?
Yes. The calculator converts your rise and run to the equivalent X:12 pitch.