Board Foot Calculator

For no good reason other than being a little lazy, I have been using this calculator to do the job for me. There are, of course, tons of versions out there. And frankly, the conversion is pretty easy, so I probably should just do the math...
or you could refer to a chart:

1” x 4” x 1’ = 0.33 bd. ft.
1” x 6” x 1’ = 0.50 bd. ft.
1” x 8” x 1’ = 0.67 bd. ft.
1” x 10” x 1’ = 0.83 bd. ft.
1” x 12” x 1’ = 1.0 bd. ft.
2” x 4” x 1’ = 0.67 bd. ft.
2” x 6” x 1’ = 1.0 bd. ft.
2” x 8” x 1’ = 1.33 bd. ft.
2” x 10” x 1’ = 1.67 bd. ft.
2” x 12” x 1’ = 2.0 bd. ft.

Check here for a more inclusive reference list. And here for a version available for excel.