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