Gallons (UK) to decaliters converter above calculates how many decaliters are in 'X' gallons (UK) (where 'X' is the number of gallons (UK) to convert to decaliters). In order to convert a value from gallons (UK) to decaliters (from gal to daL) type the number of gal to be converted to daL and then click on the 'convert' button.