Locate the electrical information label on the appliance. This is a metal stamp permanently affixed to the body of the appliance. In some instances the information is embossed directly onto the surface of the appliance. This label contains all electrical information for the appliance.
Locate the wattage usage information. If there is more than one number use the largest.
Ascertain the voltage requirements of the appliance. This information is also available on the electrical information stamp.
Divide the wattage by the voltage. Amperage times voltage equals the wattage of the appliance. Thus, wattage divided by voltage calculates the amperage requirements.