Roof Pitch Calculator
Calculate your roof pitch from rise and run measurements or enter an angle in degrees. See results as X:12 ratio, degrees, slope percentage, and rafter length — with a live visual diagram.
Understanding Roof Pitch
Roof pitch is the measure of a roof's steepness, expressed as the ratio of vertical rise to horizontal run. In the United States, pitch is given in the X:12 format — a 6:12 pitch means the roof rises 6 inches for every 12 inches of horizontal distance.
Knowing your roof pitch is essential for calculating the correct amount of roofing materials, estimating costs, and choosing appropriate materials. Steeper pitches shed water and snow more effectively but cost more to build and maintain.
Our roof pitch calculator supports both rise/run input (in inches, feet, centimeters, or meters) and direct angle input in degrees. Results include the pitch ratio, angle, slope percentage, pitch factor for area calculations, and material recommendations based on your specific pitch.