How do I calculate roof pitch?
Measure the vertical rise over a 12-inch horizontal run. If the roof rises 6 inches in those 12 inches, the pitch is 6/12. This calculator also converts that ratio into degrees, percent slope, and a pitch multiplier.
Calculators
PitchCalc
Free roof pitch calculator for rise, run, degrees, slope, and multiplier
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Ahrefs Domain Rating set in type 17 Oct 2026, reset 10 Oct 2026.
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PitchCalc converts roof rise and run into pitch ratios, degrees, slope percentages, and multipliers for planning roof geometry and material quantities.
The story so far
PitchCalc provides free browser-based roof math tools that convert rise and run measurements into pitch ratios, degrees, slope percentages, and pitch multipliers. The suite includes calculators for pitch conversion, roof area, rafter geometry, roofing squares, and shingle bundles. All calculations run in your browser with transparent formulas and no signup required. The tools are designed for homeowners, roofers, contractors, estimators, and learners who need to check basic roof geometry or prepare planning quantities.
Typeset features
- Converts rise and run to pitch ratio (X:12 format)
- Displays roof pitch in degrees
- Computes pitch multiplier for area conversion
- Calculates rafter length
- Roof area calculator for sloped surfaces
- Shingle bundle quantity calculator
- Transparent formula display
- Input mode selection for rise/run, angle, or slope percent
Pricing
Pricing model: Free
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Questions and answers
What is a 6/12 roof pitch?
A 6/12 pitch rises 6 inches for every 12 inches of run. That is about 26.6 degrees, a 50% slope, and a 1.118 pitch multiplier. It is a common conventional residential pitch in the United States.
What is a pitch multiplier?
The pitch multiplier converts a horizontal footprint into sloped roof area: multiplier = √(1 + (rise ÷ run)²). Multiply the building's projected area by this factor to estimate actual roof surface.
Is roof pitch the same as roof slope or roof gradient?
They describe the same geometry in different units. Pitch is usually X-in-12, slope is often a percentage, and gradient or angle is degrees. This page keeps all three in sync so you do not need separate calculators.
What counts as a low, conventional, or steep slope?
This tool labels under 2/12 as flat, 2/12 to under 4/12 as low slope, 4/12 through 9/12 as conventional, and above 9/12 as steep. Manufacturer and code limits still govern which materials you can install.
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