The units displayed for the calculated output values can be set by selecting the Options | Unit Preferences menu item. Each property can be selected from the list, and the preferred units applied by selecting the desired unit from the list, and clicking the Set As Preferred Unit button. The units that appear in the list of available units for the input properties can be controlled by checking or unchecking the box next to each unit listed for a property. The selected units can be set as the user's default, so they are used every time the user starts SteamCalc. Multiple unit configurations can be saved to a file and recalled at a later time using the Save/Load Preferences buttons.