What a refrigerator actually draws
Two different numbers get attached to refrigerators, and they do not measure the same thing. The first is nameplate wattage — the peak electrical draw stamped on the data plate, which is what the appliance pulls when everything inside it is running at once. The second is running wattage averaged over real operation, which is far lower.
The Department of Energy's appliance wattage table lists 725 W for a 16 cubic foot frost-free unit. That figure is real, but it describes the compressor, condenser fan and defrost heater drawing together at peak. Multiply it by 24 hours a day, as a great many published appliance tables quietly do, and you get 17.4 kWh a day and over 6,300 kWh a year, which would make the fridge the largest single load in most houses. It overstates a modern refrigerator roughly tenfold.
The missing concept is duty cycle: the share of the time a thermostatically controlled appliance is actually drawing power rather than coasting at temperature. A refrigerator is plugged in 24 hours a day, but the compressor only runs about a third of that — roughly 8 hours of genuine run time, broken into short cycles that fire whenever the interior drifts a degree or two above setpoint. Between cycles the unit draws almost nothing: a control board, an interior light when the door opens, sometimes a small evaporator fan.
Averaged over full cycles, a typical modern refrigerator behaves like about 150 W of continuous draw, with a realistic spread from 100 W for a small, new, well-ventilated unit to 300 W for a large or aging one. Duty-cycle hours, not 24, are the honest basis for any cost estimate.
What that costs, worked through
The arithmetic is the same for every appliance on this site: watts multiplied by hours of actual running, divided by 1,000, gives kilowatt-hours per day.
For a refrigerator at 150 W running 8 hours: 150 × 8 = 1,200 watt-hours, divided by 1,000 is 1.2 kWh per day. Multiply by 30.4, the average number of days in a month, and you get 36.5 kWh per month. At the US average residential rate of 18.44 cents per kWh, that is 36.5 × $0.1844 = about $6.73 a month, or roughly $80.75 a year. Per day it is about 22 cents — less than the coffee that goes into it.
Run the ends of the range the same way. A 100 W effective draw gives 0.8 kWh a day, 24.3 kWh a month, about $4.48. A 300 W effective draw gives 2.4 kWh a day, 73 kWh a month, about $13.46. So the plausible spread across real refrigerators is roughly $4 to $14 a month, and almost all of that spread comes from the unit and its placement rather than from anything you do at the door.
Your own rate is the other variable, and it moves the answer more than most people expect. At 12 cents a kWh the same fridge costs about $4.38 a month; at 30 cents it costs about $10.95. Find the price you actually pay by dividing your bill's total dollars by its total kWh — that blended figure includes delivery charges, not just the supply price — and put it into the kWh cost calculator rather than using a national average.
Why the published annual figures disagree so violently
This is where refrigerator numbers get genuinely confusing, and the confusion is worth understanding rather than papering over. The EnergyGuide label on a new refrigerator typically claims 350 to 450 kWh a year. The Energy Information Administration's 2020 Residential Energy Consumption Survey, which measures what households actually consume, puts refrigeration at 839 kWh a year for the average US home. That is nearly a factor of two apart, and both are correct.
The label describes one new unit tested under standard laboratory conditions. The survey describes every refrigerator in the house under real ones. The gap is made up of three things: second refrigerators sitting in hot garages, primary units that are 15 or 20 years old and predate two rounds of federal efficiency standards, and ambient conditions no test lab reproduces. The figure used here, 36.5 kWh a month or about 438 kWh a year, sits deliberately between the two.
Beyond that, the drivers are specific and mostly physical:
- Ambient temperature. A fridge is a heat pump moving warmth out of the box into the room. The hotter the room, the harder that is and the longer each cycle runs.
- Age and standard. Compressor and insulation improvements are large and cumulative; a unit from the 1990s is in a different class entirely.
- Size and configuration. More interior volume means more surface area losing cold, and side-by-side units with through-door ice and water run more than plain top-freezers.
- Door openings and load. Every opening dumps cold air; putting warm food straight in forces a long recovery cycle.
One warning on seasonality: if you meter your fridge for a week in July and multiply by 12, you will overstate the year. Duty cycle falls when the kitchen cools.
Whether it is worth doing anything about
Two things genuinely help, and they are both about heat rejection rather than settings.
Vacuum the condenser coils, and give the unit two to three inches of clearance on the sides and back. A condenser caked in dust or boxed into a tight cabinet cannot dump heat into the room, so the compressor simply runs longer cycles to reach the same setpoint. No thermostat adjustment fixes that, because the thermostat is not the constraint — heat transfer is. This costs nothing but fifteen minutes and it is the only maintenance on a refrigerator that reliably shows up on a bill.
Now the honest part. On a unit already running well, the remaining levers are small. Keeping the fridge at 37–40°F rather than colder than necessary, not leaving the door hanging open, and letting hot leftovers cool on the counter first are all sensible, and together they might move a $6.73 monthly cost by well under a dollar. That is not nothing over a decade, but it is not a household budget problem either, and anyone promising dramatic savings from fridge habits is selling something.
The exception is large enough to change the arithmetic completely: a second refrigerator. An old spare in the garage, kept running year-round to hold drinks and occasional overflow, is a substantial share of that 839 kWh survey figure. Retiring one can plausibly save 300 to 400 kWh a year — $55 to $75 at the average rate, and considerably more in a high-rate state. Replacing a working primary fridge purely to save energy rarely pays back before the new one wears out. Unplugging a barely used second one pays back immediately.
How it compares with everything else you plug in
At 36.5 kWh a month, a refrigerator is the largest always-on load in a typical kitchen, and that constancy is what gives it its reputation. It runs while you sleep, while you are at work and while you are on holiday. Nothing else in the kitchen does.
Set against individual appliances, though, it is mid-sized. An electric clothes dryer runs about 54.7 kWh a month despite being idle 97 percent of the time, because it draws thousands of watts when it runs. An electric oven and cooktop together come to roughly 24.1 kWh. A dishwasher is about 10.9 kWh. A clothes washer, counting only the machine and not the water heating, is about 6.1 kWh. So the fridge uses six times what the washer does and about two-thirds what the dryer does.
Against the whole bill, it is smaller than it feels. In most homes, space heating, air conditioning and water heating dominate everything else combined, and refrigeration is a steady minority share. The useful exercise is proportional: take the total kWh printed on your electricity bill, divide 36.5 into it, and see what fraction you get. If the fridge is 5 percent of your usage, then even a heroic 20 percent improvement changes your bill by 1 percent, and your attention belongs on the heating and cooling line instead.
You can run that comparison for anything else in the house with the appliance energy cost calculator, or work backwards from a surprising bill with the guide to why your electric bill is so high.
Frequently asked questions
How many watts does a refrigerator use?
A typical household refrigerator averages about 150 watts of running draw, with most units falling between 100 and 300 watts depending on size, age and where they sit. That is not the same as the number in a wattage table: DOE lists 725 W for a 16 cubic foot frost-free unit, which is what the compressor, condenser fan and defrost heater pull together at peak. Because the compressor only runs about eight hours out of every 24, the averaged figure is the one to use for cost. Multiplying peak wattage by 24 hours overstates a modern refrigerator roughly tenfold.
How much does it cost to run a refrigerator per month?
About $6.73 a month at the US average rate of 18.44 cents per kWh. The working: 150 watts of running draw over 8 hours a day is 1.2 kWh daily, which is 36.5 kWh over an average 30.4-day month, which at $0.1844 per kWh comes to $6.73. Across the realistic range of units, expect roughly $4.48 a month at the low end and $13.46 at the high end. Your rate matters as much as your appliance: the same refrigerator costs about $4.38 a month at 12 cents per kWh and about $10.95 at 30 cents.
Does unplugging a refrigerator save money?
Not on your main refrigerator, for the obvious reason that it has food in it. There is no meaningful standby load to eliminate either — a fridge draws essentially nothing between compressor cycles, so unplugging it overnight would save a few cents while risking the contents. A second refrigerator is a completely different question. An old spare running year-round in a hot garage can use 300 to 400 kWh a year on its own, $55 to $75 at the average rate. If it holds a few drinks, unplugging it is one of the largest single-appliance savings available in most houses.
Is it cheaper to run a refrigerator at night?
Only if you are on a time-of-use rate, where the price per kWh changes by hour, and even then the saving is limited because you cannot choose when the compressor runs. The thermostat decides that, and it decides around the clock. What you can shift is the load you add: making ice, chilling a large batch of groceries or running the automatic defrost on units that allow scheduling. Realistically this is a few cents a month. If you are on a time-of-use plan, the appliances worth shifting are the dryer, dishwasher and EV charger. See what a time-of-use rate is.