How to Calculate 3/12 Pitch Rafter Length

To calculate the rafter length, input either the Run or the Rise into the calculator and click calculate. The system will automatically compute the rafter length for you.

Note: "3 12 Pitch" indicates that for every 12 horizontal units, the roof rises 3 units. This results in a shallower slope compared to higher pitch roofs.

3/12 Roof Pitch Multiplier

3/12 roof pitch multiplier is 0.2500

3/12 Pitch Roof Angle

3/12 pitch roof angle is approximately 14.04 degrees

3/12 Roof Pitch Template