Roof Pitch Calculator

Roof Pitch Calculator turns a simple rise and run into everything you need: the roof pitch as a ratio (X:12), the angle in degrees, and the rafter length — instantly and fully offline. Enter the rise (vertical) and run (horizontal) of your roof and get: • Pitch as a standard X:12 ratio • Roof angle in degrees • Rafter length (the sloped line from ridge to wall plate) Works in metres or feet. No internet, no account, no data collected. Built for roofers, carpenters, framers and DIY builders sizing a roof, cutting rafters or checking a pitch on site. A fast, no-nonsense field tool. Roof pitch, roof angle, rafter length, pitch to angle, X:12 pitch — a simple, free calculator from Fernhart Labs.