Calculate roof pitch, angle, and grade based on rise and run measurements.
Slope Measurements
Roof Slope Specifications
Enter rise and run to see roof specs
About this calculator
Overview
Roof pitch is a numerical measure of the steepness of a roof. It is most commonly expressed as a ratio of 'rise' over 'run', typically based on a 12-inch horizontal run.
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Pro Tips
Measure the rise and run from the attic if possible for the most accurate results.
A standard level and a tape measure are all you need to find the pitch from the roof surface.
Always consider the roof pitch when choosing roofing materials; some are better suited for low or high slopes.
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Fun Facts
"A 4/12 pitch is considered the minimum for standard asphalt shingles."
"Steeper roofs (over 9/12) are often called 'sharp' or 'steep' and require extra safety precautions."
"The 'Area Multiplier' helps estimate total roof surface area from the flat footprint area."
