How this calculator works
Convert roof rise and run into pitch ratio, angle and slope percentage.
angle = atan(rise ÷ run); slope% = rise ÷ run × 100
Roofing · Calculator
Convert roof rise and run into pitch ratio, angle and slope percentage.
Convert roof rise and run into pitch ratio, angle and slope percentage.
The calculator uses the following core relationship:
Estimating note: Actual material quantities can vary with site conditions, detailing, product dimensions, installation method, and waste.
A roof pitch calculator converts roof rise and run into pitch ratio, angle and slope percentage.
Roof geometry affects material quantities and drainage performance.
Engineering note: Use these calculations for estimation and planning. Always confirm final designs according to project requirements and applicable standards.
Convert roof rise and run into pitch ratio, angle and slope percentage.
The calculator uses inputs such as Rise (mm), and Run (mm). Use values from your drawings, measurements, product data, or project specifications.
Use outputs such as Pitch (rise:run), Roof angle, Slope, and Slope factor for estimating and cross-checking. Before purchasing or construction, confirm the dimensions, units, waste factors, supplier packaging, and project specifications.
Continue your estimate with related Construction Calc Lab.