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Calculate roof pitch, angle, and rise from run and ridge height.
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Roof pitch calculator guide
Calculate roof pitch, angle, and rise from run and ridge height. This free online calculator is designed for people who need a quick, transparent estimate rather than a black-box answer. Enter rise, run, review the assumptions, and adjust the values to match your project or situation.
Pitch compares vertical rise with horizontal run; angle is derived from the rise-to-run relationship.
For a useful first estimate, start with the sample values already shown in the calculator, then replace them with your own measurements or figures. Keep all dimensions in compatible units and round up where the result represents a quantity you must buy.
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision.
How it works
Calculate roof pitch, angle, and rise from run and ridge height. This tool explains the calculation so you can adjust the assumptions to match your situation.
Common questions
Calculate roof pitch, angle, and rise from run and ridge height. The page shows the result, a breakdown, and the formula used so you can check the calculation.
You will need rise, run. The labels and units beside each field show what the calculator expects.
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision. Accuracy depends on the quality of the inputs and the assumptions used by the underlying formula.