JML is correct that span tables are the way you figure the maximum span for a particular application. But you need to know the particular species of wood.
If you just want to compare the stiffness of two pieces of lumber with different cross-sections, you can do that by calculating and comparing the moments of inertia of their respective cross sections. (Assuming that the wood species is the same.) That's quite easy to do for most lumber. This Wikipedia article explains the theory; about halfway down you'll find the formulas for different cross sections.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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