A washing machine typically uses 350 to 500 watts of power. The specific wattage for most washing machines is found on the nameplate, which is typically located on the bottom or back of the appliance. The washer's wattage indicates the maximum power drawn by the appliance.
Wattage is found by multiplying the voltage of an appliance times the amp draw of the appliance. Wattage is also found by using an ammeter to measure an appliance's amp draw. The amount of power an appliance consumes also depends on the setting used. One example of this is the volume setting on a radio. Many appliances, such as televisions, computers and kitchen appliances, continue to draw small amounts of stand-by power when they are turned off. This increases the energy consumption of an appliance by a few watt-hours.