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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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