About

Pitch12 is a small set of jobsite calculators. The first tool is a roof pitch converter: rise, run, angle, X-in-12, rafter length, and slope factor. Every number is computed in your browser with ordinary trigonometry.

The site is independent. It is not a contractor, not an engineering firm, and not affiliated with Omni Calculator, Blocklayer, or any roofing manufacturer. We publish the formulas on the tool page so you can check the arithmetic yourself.

More geometry tools may follow (rafter length as its own page, roofing squares). We will not add accounts, chat, or paid APIs to the core calculators.