Task: Convert 5.6 cubic centimeters to cubic millimeters (show work) Formula: cm3 x 1,000 = mm3 Calculations: 5.6 cm3 x 1,000 = 5,600 mm3 Result: 5.6 cm3 is equal to 5,600 mm3. For quick reference purposes, below are conversion tables that you can use to convert from mm3 to cm3, and cm3 to mm3.