Kilocalories to gallon-atmosphere (US) converter on this page calculates how many gallon-atmosphere (US) are in 'X' kilocalories (where 'X' is the number of kilocalories to convert to gallon-atmosphere (US)). In order to convert a value from kilocalories to gallon-atmosphere (US) (from kcal to gal atm) type the number of kcal to be converted to gal atm and then click on the 'convert' button.