The roof pitch calculator calculates rise, run, slope, pitch, angle, and rafter length. Use the diagrams on this page when referring to the Input section and to interpret the calculated Results.

This roof pitch calculator is a handy tool that will help you quickly assess the pitch of your roof and what length rafters you need for your construction works.

The Roof Pitch Calculator makes it easy to calculate your roof pitch in seconds. Simply enter the roof run and rise, and get the rafter length, roof pitch in degrees, and roof pitch as a percentage.

Jan 29, 2026 · Calculate roof pitch, slope angle, and rafter length instantly. Enter your rise and run measurements to get precise results for roofing, carpentry, and construction projects.

Comprehensive roof pitch chart with common pitches, angles, percentages & applications. Use our calculator and guide to choose the right roof slope.

Calculate roof pitch instantly and reference the complete pitch multiplier chart from 1/12 to 18/12. Get angle, slope percentage, and pitch factor for any roof. Free, no sign-up required.

Free roof pitch calculator to convert between degrees, ratios & percentages instantly. Calculate roof slope and pitch multiplier with installation recommendations.

Free roof pitch calculator built for contractors. Enter rise and run to get rafter length, slope in degrees, percent grade, and x:12 ratio instantly.

Use our roof pitch calculator to find the pitch, slope, degrees, and rise over run of a roof. Plus, learn four methods to measure pitch.

Knowing your roof pitch helps with planning construction, choosing materials, and estimating how water or snow will run off the roof.