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