Astrio Convert is a unit conversion program for Windows. In the Category field a category of values for conversion is selected including length mass temperature volume area speed time pressure energy power data size and angle. After selecting a category the source and target units of measurement are specified in the From and To fields for example for length kilometers meters decimeters centimeters millimeters micrometers nanometers miles yards feet inches nautical miles and light years are available. The Swap button swaps the selected units of measurement in the From and To fields.