Roof Pitch Calculator
Construction
Compute roof slope angle, pitch ratio and rafter length.
Pitch = rise / run ; angle = atan(rise/run)
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Estimate before you order
5 calculators
Construction
Square footage, gravel and mulch volumes, stair rise and run, roof pitch: measure once, type it in, and get an order-ready estimate before you leave for the supply yard.
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Enter your measurements and read the estimate. Each tool explains its formula and typical waste allowances.
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Why use these calculators
Order-ready estimates
Get volumes in cubic yards and bag counts, with typical waste allowances explained so you buy enough the first time.
Formulas from the trades
Rise-and-run guidance, coverage rates, and pitch math follow the conventions builders actually use, and each page shows its work.
Fast enough for the job site
Runs in your phone browser with no app, no login, and no uploads of your measurements.
Frequently asked questions
Enter the length, width, and depth of the area and the calculator returns the volume in cubic yards with an approximate bag count. Adding a 5 to 10 percent waste allowance is standard practice.