Roof Pitch Calculator

Enter rise and run or use the common x-in-12 format to calculate roof slope geometry.

Rise

Run

Display basis

—Pitch

—Angle

—Slope

—Rafter factor

—Geometry conversion only

How to use this Roof Pitch Calculator

Convert roof rise and run into pitch, angle, slope percentage, and rafter factor. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.