Method #1: Using the Energy Star Rating to Figure Out the Average Power Consumption:
The easiest method is to google your refrigerators model number and see if it has an Energy Star Rating. If it does, the estimated yearly electricity usage is usually provided. A typical Energy Star Label may look like this:
Example using the above label:
Energy consumption: 227 kWh per year - (that is 227,000 Watts hours per year);
If you take 227,000 and divide it by the number of days in a year (365) that will give you 621.91 watt hours per day: ( 227,000 / 365 = 621.91 wh ).
If you divide 621.91 watt hours by the number of hours in a day (24) you get 25.91 average running watts: ( 621.91 / 24 = 25.91 ).
If you divide the running watts by the voltage you will get the amps (Watts/Volts = Amps). Most refrigerators in the US and Canada run on 120 volts, so you take the 25.91 average watts and divide that by 120 volts you will find that the refrigerator averages .21 amps: ( 25.91 / 120 = .21 ).