Kilocalories to liter-atmosphere conversion calculator shown above calculates how many liter-atmosphere are in 'X' kilocalories (where 'X' is the number of kilocalories to convert to liter-atmosphere). In order to convert a value from kilocalories to liter-atmosphere (from kcal to L atm) simply type the number of kcal to be converted to L atm and then click on the 'convert' button.