About RoofRatio

RoofRatio is built for homeowners checking a roofing quote and for the people writing those quotes. Every calculator uses the same pitch multipliers, so the roof pitch, the squares, the bundles and the rafter lengths all agree with each other. You can measure from the ground and still see whether a quote's square count is reasonable.

How the numbers are checked

The calculators use standard roof framing geometry: pitch as rise over a 12-inch run, slope multipliers from the Pythagorean theorem, and the industry convention of 100 square feet per roofing square. Every tool runs in your browser, and each page shows its formula so you can check the math yourself. Before publishing, every calculator is tested against worked examples, and pages are reviewed when standards or reference data change.

Limits

Results are estimates for planning. They do not replace a site survey, a qualified professional, or the rules that apply where you live.

Corrections

If a figure looks wrong, please contact us with the page and the value. Confirmed errors are fixed quickly.