Gallons (US liquid) to fluid drachms converter on this page calculates how many fluid drachms are in 'X' gallons (US liquid) (where 'X' is the number of gallons (US liquid) to convert to fluid drachms). In order to convert a value from gallons (US liquid) to fluid drachms (from gal to fl drc) type the number of gal to be converted to fl drc and then click on the 'convert' button.