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Free homeowner tool

Roof Pitch & Area Calculator

Convert roof pitch to degrees, find your slope multiplier and estimate roof squares and shingle bundles from your home's footprint.

6/12
Your roof
=
Slope multiplier
Roof surface area
Roofing squares
Squares to order
Shingle bundles (3/sq)
Walkability

Get it measured for free Footprint-based estimate. Dormers, multiple roof planes and porches change the total; a measured inspection is the only exact number.

What roof pitch means

Roof pitch is the number of inches a roof rises for every 12 inches of horizontal run. A 6/12 roof rises 6 inches per foot, about 26.6 degrees. Most homes in Katy subdivisions fall between 6/12 and 9/12, while many older ranch homes near Old Town Katy sit closer to 4/12 or 5/12.

Why pitch matters for your roof

  • Material choice: asphalt shingles need at least 2/12 with special underlayment, and 4/12 or more is standard. Lower slopes need membrane or low-slope metal systems.
  • Cost: steeper roofs have more surface area and need extra safety gear, which raises labor.
  • Drainage: steeper slopes shed Katy's heavy rain faster and resist wind-driven water better.

How to find your pitch

Safely, from a ladder at the gable end: hold a level horizontally against the roof edge, measure 12 inches along it, then measure straight up to the roof surface. That number is your rise. Or skip the ladder and let us measure it during a free roof inspection. Then plug your numbers into the roof cost calculator.

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FAQ

Questions about this tool

What is the most common roof pitch in Katy?

Most two-story homes in Katy's master-planned communities have roofs between 6/12 and 9/12, with steeper front gables for curb appeal.

How many bundles of shingles are in a square?

Most architectural shingles come three bundles to a square (100 sq ft). Some heavier designer shingles need four or five.

How much waste should I add?

About 10% for a simple gable roof, 15% for hip roofs and up to 20% for complex roofs with many valleys and dormers.

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