Rafter Help is the easiest way to calculate rafter length and associated values when building!

Quickly find roof pitch, rafter lengths and ridge height for gable roofs, based on room and ridge width. 
Or calculate length values with more control from the Advanced tab.

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