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Tables 1: Rafter Table

A rafter table is commonly imprinted on the steel square (carpenter square, rafter square, framing square). I've revised it a bit to include angles, instead of side cuts for hip and valley rafters which aren't used much. [for info on how to use these tables see Rafter Tables on the Framing Square]

Roof Pitch:Length of common rafters per foot of runLength of hip or valley rafter per foot of run Difference in length of jacks on 16" centersDifference in length of jacks on 24" centersAngle in degrees
212.1617.0916 1/424 5/169 1/2
312.3717.2316 1/224 3/414
412.6517.4416 7/825 3/1618 1/2
513.0017.6917 5/162622 1/2
613.4218.0017 7/826 7/826 1/2
713.8918.3618 1/227 7/830 1/4
814.4218.7619 1/428 7/833 3/4
1015.6219.7020 7/831 1/439 3/4
1116.2820.2221 3/432 5/842 1/2
1216.9720.7822 5/83445

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(Ask Dave) (About Dave)

Your source for building tips, woodworking & furniture plans, house plans and building advice directly from Dave...

Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.


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