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