Roof Pitch Calculator
Convert roof pitch formats and estimate rafter length from run and rise.
How to use
Pitch is often written as rise:run over 12 (e.g. 6/12). Percent slope = rise/run × 100.
Frequently asked questions
Do you store the numbers I enter?
Calculations run in your browser. Inputs are not sent to our servers.
Are the results guaranteed accurate?
Standard formulas are used. Double-check important decisions with a professional or official source.