A device (100) for determining an appropriately sized medical undergarment for a wearer includes a housing (101) and a wheel (102). A first body mass index factor alignment indicator (108) can be aligned with a first body mass index factor, such as weight of a wearer, thereby revealing color coded symbols (109) aligned with a plurality of second body mass factor alignment indicators (110). A user selects the appropriate size by determining which color is aligned with a second body mass factor alignment indicator of the wearer. An optional second side (205) of the device (100) can be used to determine an appropriate type of medical undergarment based upon urinary output, wearer mobility, or combinations thereof.
