Glen's rafter calculator


This will list all rafter lengths for a hip roof.
All you need is the roof pitch and the span measurement.
You can also enter the over hang and the wall height difference.
The measurments for the overhang must be in decimal form.
Fractions are not allowed (use .5 not 1/2 for half an inch).

Enter a title for this roof span.

Enter the pitch for the rafters that bear the ridge:

Enter the difference in wall heights (in inches):

Enter the pitch at the ends of the ridge:

Fractions are not allowed (ex: use 17.5 not 17-1/2).
Enter the overhang (in inches):

Enter the span measurement (feet part only):

Enter the span measurement (inch part only):

Enter the fraction part of inches (1/4 or 5/8 etc):



Click for definitions.