Appliance Running Cost Calculator
Standby runs for 8,760 hours a year.
Work out Appliance Running Cost. Standby runs for 8,760 hours a year. Counts the thing everyone forgets to count.
On the label or in the manual
What it draws when switched off but plugged in
Cost to run for a year
101.92
0.280 per use · 364 kWh a year in active use
The power rating is a maximum rather than a constant draw for most appliances. A washing machine pulls its rated power only while heating water, and a fridge cycles on and off, so a measured figure from a plug-in energy monitor beats the label for anything that does not run flat out.
How the Appliance Running Cost Calculator works
What an appliance costs to run per use, per day and per year, with standby power counted separately over the hours it is idle. Standby is the figure people do not believe until it is annualised.
Also known as: how much does it cost to run a tumble dryer · watts to cost per hour calculator · standby power cost calculator · electricity cost of an appliance
Watts, kilowatt-hours, and the factor of a thousand
Electricity is billed in kilowatt-hours: one kilowatt drawn for one hour. An appliance rated in watts has to be divided by 1,000 first, and that division is where most of these calculations go wrong — by a factor of exactly a thousand, which at least announces itself.
A 2,000 W appliance run for half an hour uses 1 kWh. At 28p that is 28p a use, £1.96 a week if used daily, and about £102 a year. The per-use figure is small enough to ignore and the annual figure is not, which is the entire reason for annualising.
The rating plate is a maximum rather than a constant draw. A washing machine pulls its rated power only while heating water; a fridge cycles on and off. For anything that does not run flat out, a plug-in energy monitor gives a far better figure than the label.
Standby, and the 8,760-hour year
Standby power is small and continuous, and continuous is what makes it matter. A device drawing 5 W does so for 8,760 hours a year, which is 43.8 kWh — about £12 at 28p, from a load nobody would notice on any single bill.
One device is trivial. A modern household has a set-top box, a games console, several chargers, a microwave clock, a television, a router and a smart speaker, and the total reaches a figure worth acting on. It is invisible precisely because it is spread across everything.
The calculation here applies standby across the hours the appliance is not in active use, rather than across the whole year, which avoids double-counting the hours it is running. For something used an hour a day the distinction barely matters; for something used constantly it does.
Which appliances actually cost money
Anything that heats dominates: electric showers, immersion heaters, tumble dryers, ovens, kettles. Converting electricity to heat is inherently power-hungry, which is why a 9 kW shower costs more per minute than almost anything else in the house.
Anything that runs continuously comes second. Fridges and freezers draw modest power and never switch off, so a year of it adds up. This is the profile where an efficient replacement can genuinely pay for itself, because the saving accrues every hour for a decade.
Electronics are mostly a rounding error in active use and matter through standby. The practical order of attack is therefore: heating loads first, always-on appliances second, standby third — which is roughly the opposite of the order most energy-saving advice presents them in.
Where to go next
The Appliance Running Cost question rarely arrives on its own. These are the ones that usually come with it:
- Water Bill Calculator — The standing charge does not fall when you use less.
- Solar Payback Calculator — Self-consumption decides the answer, not system size.
- Household Budget Calculator — Unallocated money is money without a job.
- Loan & EMI Calculator — Monthly payment, total interest, and a full amortization schedule.
Not financial advice. This calculator is for planning and illustration, not financial advice. Real products carry fees, taxes, and terms it does not model. Confirm figures with your lender or a qualified adviser before committing.
Frequently asked questions
How do I calculate the running cost of an appliance?
Multiply the power rating in kilowatts by the hours used, then by your price per kilowatt-hour. A 2,000 W appliance for half an hour uses 1 kWh, which at 28p costs 28p.
How much does standby power cost?
A few watts drawn continuously runs for 8,760 hours a year. At 5 W and 28p per kWh that is about £12 a year for one device — small individually and meaningful across a house full of them.
Is the power rating the actual consumption?
It is a maximum rather than a constant. A washing machine draws its rated power only while heating water, and a fridge cycles on and off, so a plug-in energy monitor gives a much better figure for anything that does not run flat out.
Which appliances cost the most to run?
Anything that heats: electric showers, immersion heaters, tumble dryers, ovens and kettles. Anything that runs continuously comes next — fridges and freezers are modest per hour and never switch off.
What is a kilowatt-hour?
One kilowatt of power drawn for one hour. It is the unit electricity is billed in, and converting watts to kilowatts — dividing by 1,000 — is where most of these calculations go wrong.
Does an energy-efficient appliance pay for itself?
Compare the annual running cost difference against the price difference. For something used daily over a decade it often does; for something used occasionally it usually does not, however good the efficiency rating looks.
How do I measure actual consumption?
A plug-in energy monitor records real usage over time and costs very little. For anything that cycles or heats intermittently it is far more accurate than the rating plate.
Do smart meters help reduce bills?
Only through what they show you. The meter itself changes nothing; the in-home display makes consumption visible, and visible consumption tends to fall. The effect is real and modest.
Is it cheaper to run appliances at night?
Only on a time-of-use tariff. On a flat tariff the time makes no difference, and running a tumble dryer overnight while asleep carries a fire risk that some insurers take a view on.
What is phantom load?
The power drawn by devices that are switched off but plugged in. Individually small, and across a modern household it adds up to a measurable annual sum — chargers, set-top boxes and anything with a standby light.
How much does an electric shower cost per use?
A 9 kW shower for ten minutes uses 1.5 kWh, which at 28p is about 42p. It is one of the highest-power appliances in most homes and its cost is genuinely proportional to time spent.
Does an old fridge cost much more than a new one?
Often substantially. Refrigeration efficiency has improved a great deal, and a fridge runs continuously for a decade or more — which is exactly the profile where a replacement can pay for itself.
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