Refrigerator
How much electricity does a refrigerator use?
Running watts 100–400 · average 1.0–2.0 kWh/day · around $4–$10 per month at 16.5¢/kWh
The number on the label is a trap. A refrigerator's compressor runs roughly 30–50% of the time, then shuts off. That is why you will see wildly different figures quoted — a fridge that draws 250 W while the compressor is on still averages under 100 W across a full day.
What actually drives the number
- Age: a fridge built before 2010 typically uses 2–3× the energy of a modern Energy Star unit. This is the single biggest factor.
- Size: a small under-counter fridge uses about 0.6 kWh/day; a 25 cu ft French door can reach 2.5 kWh/day.
- Setting: dropping the fridge from 38°F to 34°F is not free, and running the freezer at -10°F instead of 0°F can add 20–30%.
- Placement: a fridge beside an oven or in direct sun works harder. So does one with a blocked coil or a worn door seal.
The quick answer
Enter 150 W and 8 hours in the calculator above for a mid-range modern fridge. If yours is a large or older unit, try 250 W and 10 hours — the difference in monthly cost is usually the difference between replacing it and keeping it.
Is a new fridge worth it?
If an old fridge uses 1.5 kWh/day more than a new one, at 16.5¢/kWh that is about $90 a year. A $700 replacement pays back in roughly eight years on energy alone — before counting the second fridge in the garage, which is often the worst offender in the house.
Frequently asked questions
How many watts does a refrigerator use?
Running watts 100–400. The figure on the rating label is the maximum draw; actual use varies with settings, age and usage pattern.
How much does it cost to run a refrigerator per month?
With the defaults above it comes to the monthly figure shown in the calculator. At 16.5¢/kWh — the US residential average — that is a realistic middle estimate. Your own bill may be 30% lower or higher depending on state.
Is it cheaper to run a refrigerator at night?
Only if your utility offers a time-of-use plan and you avoid the 4pm–9pm peak window. On a flat-rate plan, the time of day makes no difference to the total.
Does the calculator account for real-world duty cycles?
Not automatically — you enter the effective hours yourself. For compressing appliances like refrigerators and AC units, enter the running watts and roughly the proportion of time the compressor is on, which is usually 30–50%.
Will a newer refrigerator actually save money?
Compare the kWh figure in the calculator against an Energy Star model's stated annual use. If the difference is a few hundred kWh a year, the payback on a replacement is usually long; if it is over 500 kWh, it is worth pricing out.