Roof Rafter Calculations

If you plan to use a gable roof, our roof rafter calculator tools are handy for calculating the number of rafters needed, rafter length, lineal feet of rafter, board feed in ridge and sub-facia,and the total board feet in the roof.

Rise and Run means that a 6/12 pitch roof has 6" of rise (vertical) for each foot of run (horizontal).

Disclaimer: Every effort has been made to ensure the accuracy of these tools. Use them at your own risk. Always cut one rafter, fit it, and then use that rafter as a template for the others to prevent wasting material.

ROOF RAFTER CALCULATIONS
A) Roof Length In Feet	B) Rafter Length In Feet	C) On Center (inches between rafters)	D) Rafter Thickness In Inches	E) Rafter Width In Inches
ft	ft	inch	inch	inch