Tons (register) to cubic decimeters conversion calculator shown above calculates how many cubic decimeters are in 'X' tons (register) (where 'X' is the number of tons (register) to convert to cubic decimeters). In order to convert a value from tons (register) to cubic decimeters (from RT to dm³) type the number of RT to be converted to dm³ and then click on the 'convert' button.