A mini fridge looks harmless. It is small, it is quiet, and it sits in the corner of a bedroom, office or man cave doing very little visible work. But unlike a kettle or a hair dryer, it never switches off. It hums away every hour of every day, and that round-the-clock running is what turns a tiny appliance into a real line on your electricity bill. The good news is that for most people the cost is modest. The catch is that one common type of mini fridge can cost three or four times as much to run as another that looks almost identical on the shelf.
The short answer. Most mains-powered mini fridges in the UK cost between about £13 and £50 a year to run, depending on size, efficiency and type. A typical compressor model using around 100 kWh a year costs about £26 at the October to December 2026 price cap. Cheaper thermoelectric (Peltier) units run continuously and often cost far more for the same chilling power.
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The short cost answer, with numbers
A mini fridge does not draw its rated wattage all day. A compressor model switches its motor on and off to hold the set temperature, so a unit with a 60 to 100 watt compressor might only run for a third of each hour once it is cold and the door stays shut. That cycling is why the headline wattage on the plug tells you very little. What matters is the kilowatt hours it gets through over a year.
Most UK mini fridges fall somewhere between 50 and 200 kWh a year. Smaller, better-rated compressor models cluster around 80 to 120 kWh. The table below turns a few of those yearly totals into pounds at the current price cap.
| Yearly use | Cost per year | Cost per month | Typical example |
|---|---|---|---|
| 50 kWh | £13.06 | £1.09 | Small, efficient compressor model |
| 80 kWh | £20.89 | £1.74 | Average table-top fridge |
| 120 kWh | £31.33 | £2.61 | Larger or older compressor model |
| 200 kWh | £52.22 | £4.35 | Thermoelectric or drinks cooler |
At 26.32p per kWh, Ofgem cap October to December 2026.
So the spread is wide, but the middle of it is genuinely cheap. An average mini fridge costs less per month than a single takeaway coffee. The reason to read on is that the figure you land on depends almost entirely on which type you buy and where you put it.
Compressor vs thermoelectric: the choice that decides your bill
There are two very different machines sold as mini fridges, and they cost wildly different amounts to run.
Compressor mini fridges work the same way as a full-size fridge. A small pump compresses refrigerant gas, and a thermostat switches it on and off as needed. Because the compressor only runs when the temperature drifts up, these units spend a lot of each hour doing nothing. That makes them efficient. They are also the only type that can hold a proper cold temperature in a warm room.
Thermoelectric mini fridges, often called Peltier coolers, have no compressor and no moving refrigerant. They use a solid-state chip and a fan, and they can only chill to roughly 15 to 20 degrees below room temperature. The trouble is they have no thermostat in the same sense. The chip draws power constantly while the fridge is on, with no off cycle to give it a rest. A thermoelectric unit rated at 50 to 70 watts can therefore use far more over a year than a 100 watt compressor that runs for a third of the time.
If you are buying for a hot kitchen or a sunny conservatory, a thermoelectric cooler may struggle to stay cold at all, and it will run flat out trying. For anything you actually want kept reliably cold, a compressor model is cheaper to run and does the job better. The way to tell them apart is the energy label and the listed annual consumption, which we cover next.
Read the energy label before you buy
Every mains-powered fridge sold in the UK carries an energy label showing an efficiency class and, crucially, a figure for kilowatt hours per year. That single number is the one to compare, because it already accounts for the appliance cycling on and off under standard test conditions. Multiply it by your unit rate and you have your running cost before the fridge is even out of the box.
Two mini fridges of the same capacity can carry very different yearly figures. The label lets you spot that gap in seconds. Our guide to reading the energy label walks through what each part means and why the rescaled A to G classes are stricter than the old A+++ system. For a wider view of how every kitchen appliance stacks up, the appliance running cost guide puts the mini fridge next to the things it shares a plug socket with.
To work out the cost from any label figure yourself, the sum is simple:
- Take the kWh per year from the label.
- Multiply by your electricity unit rate in pounds. At the current cap that is 0.2611.
- The result is your yearly running cost.
For example, a fridge labelled at 92 kWh a year costs 92 multiplied by 0.2611, which is about £24 a year. If you are not sure what a kWh even is, our explainer on what a kWh means covers it in plain terms.
What makes a mini fridge cost more to run
The label figure assumes a tidy test environment. Real homes are messier, and several things push your actual cost up or down.
- Where you put it. A mini fridge in a warm room works harder. Standing it next to a radiator, an oven, a window in full sun or in a sealed cupboard with no airflow forces the compressor to run longer. Give it a few centimetres of clearance at the back and sides so heat can escape.
- How often you open it. Every door opening lets cold air fall out and warm air in. A mini fridge in a busy office gets opened far more than one holding drinks in a spare room, and it pays for every one of those openings.
- The temperature you set. Colder is not better for the bill. Setting it lower than you need wastes energy. For drinks and snacks, the warmer end of the fridge range is fine.
- Age and seals. An old fridge with a perished door gasket leaks cold air constantly. If the door no longer holds a sheet of paper firmly when shut, the seal is failing.
- Frost build-up. A thick layer of ice on the cooling plate acts as insulation and makes the unit work harder. Defrost it when frost gets more than a few millimetres thick.
Heat is the big one. The same fridge that sips power in a cool bedroom can cost noticeably more in a hot kitchen, the same effect covered in our piece on fridges in hot weather.
Does standby matter, and can you switch it off?
A mini fridge has no meaningful standby mode in the way a television or games console does. When it is plugged in and switched on, it is doing its job. There is no hidden idle draw to chase down, which sets it apart from most of the gadgets covered in our look at standby power across the home.
That raises a fair question: should you just unplug it when you are not using it? If the fridge sits empty for weeks at a time, yes. Unplug it, prop the door open so it does not grow mould, and you save its full running cost for that period. But for a fridge in daily use there is nothing to gain from switching it off overnight. It will simply use the same energy warming up and then cooling back down again, and you risk spoiling whatever is inside. The only real saving comes from running it less of the year, not less of the day.
If you genuinely want to know what your own unit draws rather than relying on the label, a cheap plug-in energy monitor left in place for a few days will show you the real kWh, cycling and all.
The bottom line
A mini fridge is one of the cheaper always-on appliances in a UK home. A typical compressor model costs somewhere around £20 to £30 a year, and an efficient small one can come in under £15. That is rarely worth losing sleep over. The decisions that matter are made before you buy, not after.
Choose a compressor model over a thermoelectric one if you can, because the thermoelectric type runs continuously and can quietly cost two or three times as much for worse cooling. Check the kWh per year on the energy label and do the simple multiplication against your unit rate. Then put the fridge somewhere cool with room to breathe, keep the door shut, and set it no colder than you need. Do those things and a mini fridge stays exactly what it should be: a small convenience with a small cost.