A refrigerator is the one appliance that never gets a day off, so even a modest draw adds up across a whole year. If you are wondering how much electricity a refrigerator uses, the surprising part is not the watts — it is the cycling. This guide explains running watts, the duty cycle that turns them into daily and yearly kWh, what different fridge types typically use, and the point at which an old fridge starts costing more to keep than to replace.
The short answer: watts, kWh per day and cost per year
A modern fridge draws about 100–250 watts while its compressor is running — but the compressor does not run all the time. It cycles, typically running 30–50% of the time, switching on to pull the temperature down and off again once it gets there. The result is roughly 1–2 kWh per day, or about 400–800 kWh per year for a typical modern fridge. At the dated example prices used in this guide — US electricity at about $0.173 per kWh, the 2025 average, and UK electricity at about 26.35p per kWh under the October to December 2025 price cap — that year costs about $70–$140 in the US and about £105–£210 in the UK. Drop your own rate into our appliance electricity cost calculator and the same kWh range becomes your figure, at your tariff.
Electricity use by fridge type
Size, layout and features all move the number. These are typical ranges, not measurements of any one model:
| Fridge type | Typical kWh per year | Note |
|---|---|---|
| Mini fridge | about 250–350 | Inefficient for its size |
| Top-freezer | about 400–550 | Usually the most efficient full-size layout |
| Bottom-freezer | about 500–700 | A step up in size and use |
| Side-by-side | about 650–900 | Big volume, more cooling hardware |
| French-door, through-door ice | about 700–1,000 | Ice and water features add use |
| Pre-2000 fridge, any style | about 1,200–2,000+ | Older compressors and insulation |
Two lessons stand out. First, the mini fridge is a poor bargain per litre of space — small fridges are not necessarily cheap fridges. Second, age beats layout: a pre-2000 model of any style can use two or three times the electricity of a modern equivalent, which is why the replacement maths later in this guide look so unusual.
Why the label kWh per year is the number to trust
Every fridge is sold with a kWh per year figure measured on a standard test cycle — the same conditions for every model, with the cycling built in. That makes it the one number you can fairly compare between two fridges in a shop, and the best starting estimate of what yours will use. The number you should never trust is a shortcut: multiplying the nameplate watts by 24 hours. The nameplate gives the draw while the compressor runs, and the duty cycle is the whole story — a 150 W fridge running 40% of the time uses about 1.44 kWh a day, not the 3.6 kWh the naive multiplication suggests.
To measure your own fridge, use a plug-in energy monitor for a full 24 to 48 hours and read the kWh directly, then multiply up to a year. That captures your kitchen’s temperature, your door-opening habits and your model’s real cycle in one reading. If you do not have a monitor, enter the running watts and a 30–50% duty cycle into the electricity cost calculator — the duty-cycle setting exists precisely for appliances like this.
What makes a fridge use more
- A hot home for it. A fridge in a hot garage or against a sunny wall has to pump heat uphill against a warmer room, so the compressor runs longer. Garages in summer are the worst case.
- Failed door seals. Worn or dirty gaskets leak cold air all day. Try the dollar-bill test: close the door on a bill, and if it slides out with no resistance, the seal is not gripping and warm air is getting in.
- Filling extremes. A nearly empty fridge loses its cold quickly every time the door opens, while one packed so tight that air cannot circulate makes the compressor work harder. Comfortably full is the sweet spot.
- Dust-clogged coils. The coils at the back or underneath shed the heat the fridge removes. Blanketed in dust and pet hair, they shed it badly, and the compressor pays for it.
- Temperatures set colder than needed. Fresh food is happy at 37–40°F, about 3–4°C, and the freezer at 0°F, about −18°C. Colder than that buys no extra safety, just a longer-running compressor.
When a new fridge pays for itself
Here is the replacement maths. An old fridge using 1,800 kWh a year, replaced by a modern model using 500 kWh a year, saves about 1,300 kWh — roughly $225 a year at US prices. That is why an old fridge is one of the few appliances where replacement can pay on energy alone: the saving runs every hour of every day, for the whole life of the new machine. With a fairly new fridge the same maths collapses — replacing a 600 kWh model with a 500 kWh model saves about $17 a year, which never repays a purchase. Measure, or read the label, before you decide which case you are in, and check the result at your own rate with the Appliance Electricity Cost Calculator.
And if the old fridge is a spare — the garage beer fridge — retiring it entirely saves the whole amount, not just the difference. That is why it earns its place in our ranking of what uses the most electricity in a home as the classic hidden bill-driver. For the opposite kind of load, short and heavy rather than small and constant, see how much it costs to run a dryer.
Frequently asked questions
How many watts does a fridge use?
About 100–250 watts while the compressor is running, for a modern fridge. That is a running figure, not a continuous one: the compressor cycles on and off, typically running 30–50% of the time, which is why yearly use lands at roughly 400–800 kWh rather than the much larger figure you would get by multiplying the watts by every hour in the year.
How many kWh does a fridge use per day?
About 1–2 kWh per day for a typical modern fridge. A small, efficient top-freezer in a cool kitchen sits near the bottom of that range; a large French-door model with through-door ice in a warm room sits near the top. An old pre-2000 fridge can use 3–5 kWh a day or more.
How much does a fridge cost to run per month?
A typical modern fridge uses about 50 kWh a month, which is roughly $8.65 at the US 2025 average rate of $0.173 per kWh and about £13 at the UK price cap rate of 26.35p per kWh. Bigger, older or garage-kept fridges cost more — an old model can easily run to two or three times that figure.
Is my old fridge worth replacing?
Do the kWh maths. If your fridge is a pre-2000 model using something like 1,800 kWh a year and a modern replacement uses about 500 kWh, the saving is roughly 1,300 kWh — about $225 a year at US prices — so replacement can genuinely pay on energy alone. If your fridge is fairly modern, the saving shrinks to a few dollars a month and replacement rarely pays for itself on energy.