Deciliters to gallons (UK) conversion calculator above calculates how many gallons (UK) are in 'X' deciliters (where 'X' is the number of deciliters to convert to gallons (UK)). In order to convert a value from deciliters to gallons (UK) (from dL to gal) type the number of dL to be converted to gal and then click on the 'convert' button.