How to Convert Watts to Amps

By Edwin Thomas; Updated April 24, 2017
To convert watts to amps, you must also know the voltage.

Watts and amps are both measurements involving the consumption of electricity, but they measure two different things. A watt is a measurement of power conversion, whereas amps measure the amount of electricity passing a point in a given amount of time. They can be converted, but only if you also know the voltage.

Determine the voltage. North American wall outlets operate at 110 to 120 volts.

Convert watts to amps using the proper equation: Amps equals watts divided by volts. For example, a typical 60-watt light bulb on a standard 110-volt circuit operates at 0.55 amp (60/110).

Convert amps to watts by reversing the equation: Amps multiplied by volts equals watts. A device operating on 3 amps at 110 volts consumes 330 watts (3 x 110).


Voltage, wattage and amps can be confusing concepts. It is helpful to imagine electric current as water coming from a tap and into a washing machine. The water pressure is the voltage, amps are the gallons per minute that are flowing out of the tap and wattage is the actual number of gallons the washing machine used to do its job.