Free roofing tool

Roof pitch calculator

Find your roof pitch, its angle in degrees, and the area multiplier from rise and run.

Roof pitch is the rise (inches up) over a 12-inch run. Enter your rise to get your pitch, the roof angle in degrees, and the area multiplier used to price your roof.

Rise (inches) How many inches the roof rises over the run below. Run (inches) Standard run is 12 inches. Leave at 12 for a normal x/12 pitch.

Your roof pitch

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Measure rise over a level 12-inch run for the most accurate pitch.

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What roof pitch means

Pitch is written as rise/12 — a "6/12" roof rises 6 inches for every 12 inches across. Steeper roofs shed water better, cost more to walk and work on, and have more surface area. Read roof pitch explained for the full picture.

Cost ranges reflect 2026 U.S. installed prices (BLS producer/labor data, Remodeling Cost vs. Value, and manufacturer pricing). Your real price depends on your roof, region, and pro — see the full cost guide.

FAQ

Roof Pitch Calculator questions

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How do I measure roof pitch?

Hold a level out from the roof, measure 12 inches along it, then measure straight down to the roof surface. That drop in inches is your rise — so a 6-inch drop is a 6/12 pitch.

What is a normal roof pitch?

Most homes fall between 4/12 and 9/12. Below 3/12 is "low slope" and often needs a flat-roof membrane; above 9/12 is steep and costs more to work on.

What is roof pitch in degrees?

A 6/12 pitch is about 26.6°; a 12/12 is 45°. This calculator shows the exact angle for your rise and run.

Why does pitch affect roof cost?

A steeper roof has more surface area and is slower and riskier to walk, so it costs more per square — sometimes 15–30% more than a low slope.

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