Acre-inches to cubic decameters conversion calculator shown above calculates how many cubic decameters are in 'X' acre-inches (where 'X' is the number of acre-inches to convert to cubic decameters). In order to convert a value from acre-inches to cubic decameters (from ac in to dam³) simply type the number of ac in to be converted to dam³ and then click on the 'convert' button.