I have a select_multiple field with 5 possible answers. Each answer represents a different value. e.g.: ___ AA = 1 ___ BB = 2 ___ CC = 3 ___ DD = 4 I would like the next field to sum the values base on what is checked by the user. i.e., if CC and DD are both checked, the next field would display 7. Is there an easy way to do this?