You need to check how many Watts your appliance operates on (You can
find this information on a label on the bottom or back of your
equipment, or in the manual). If you can't find this information, you
can try to find information on amperage (AMPS) of your appliance and
multiply it by input voltage (110V or 220V) to arrive at the total
wattage. Volts x Amps = Watts (i.e 110V x 0.5 AMPS = 55W).