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