Canned vs. Dry Bean Conversion
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Here are some approximate equivalents and cooking instructions:

14 oz Can beans (398 ml) : 1 1/2 c  Beans; drained
19 oz Can beans (540 ml) : 2     c  Beans; drained
 1 c  Dry beans          : 3     c  Beans; cooked
 1 lb Dry beans          : 2 1/2 c  Dry beans
 1 lb Dry beans          : 7 1/2 c  Beans; cooked

For greatest economy, cook up a whole bunch and freeze in quantities
similar to the can sizes you usually use.