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