About RoofPitchMath

RoofPitchMath 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.

Who runs RoofPitchMath

RoofPitchMath is written and maintained by Hassan Nawaz (Publisher).

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. When a source changes or a reader reports a problem, the page is checked again.

Limits

Pitch and area are estimates from measurements. They do not replace an on-site inspection or a roofer's quote, and the code minimums shown are from the model residential code, not necessarily the code where you live.

Corrections

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