Rafter Help — Roof Pitch + Length Calculator

Rafter Help is the easiest way to calculate rafter length and roof pitch when building!

Quickly find roof pitch, rafter lengths and ridge height, based on room and ridge width.

Features Include:

- Accurately solve rafter equations
- Enter pitch steepness in radians, decimal degrees or degrees, minutes, seconds (DMS) or rise/run (e.g. 8/12)
- Enter lengths in mm, cm, inches or feet
- Select your preferred number of decimal places