I'm not really positive, but I would think that 1 lb of dried beans, once properly soaked, would equal 2 (15 oz) cans of beans. Maybe more. Hopefully others with more dried bean experience will chime in.
Even if you're off a bit, you should be fine. My original recipe was 2 cans of beans and I use 3 cans now for a single recipe, just to stretch it and make more servings. I don't notice a real difference in overall taste with more or less beans, just more or less beans.
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