Appliance Electricity Cost Calculator UK

Appliance and usage

Which electricity tariff do you use?

Choose a household appliance

📺

Television

Appliance power

A typical average is pre-filled. Replace it with the wattage on your label, manual or smart plug.

Used per day

hr min

Electricity price

£/kWh

days

Where does the default price come from? The default 26.11p/kWh is Ofgem’s average capped electricity unit rate for Great Britain from 1 July to 30 September 2026. It includes VAT but not the daily standing charge. Economy 7 rates vary by supplier and region, so the two-rate values are editable examples.

Check the current Ofgem energy price cap →

Estimated cost

Cost per month—

Period	Energy	Cost
Hour	—	—
Day	—	—
Month	—	—
Year	—	—

Monthly use level

This rates only the selected appliance, not the whole home bill.

How does frequency change the bill?

Based on your appliance, power, daily use and tariff.

How much electricity do common appliances use?

Illustrative examples recalculated with your electricity price.

Appliance	Appliance power	Example use
Fridge	100 W	8 hr/day equivalent
Electric heater	2,000 W	6 hr/day, 30 days
Tumble dryer	2,000 W	1 hr 30 min, 8 days
Air conditioner	1,200 W	6 hr/day, 30 days
Gaming PC	500 W	4 hr/day, 30 days
Electric water heater	2,000 W	3 hr/day, 30 days
Television	100 W	4 hr/day, 30 days
Dishwasher	1,200 W	1 hr 30 min, 15 days
Washing machine	500 W	1 hr 30 min, 15 days
Wi-Fi router	12 W	24 hr/day, 30 days

! Rated power and actual average use can differ. Heating, cooling and thermostatic appliances often run in cycles.

Calculation formula: Power (W) ÷ 1000 × time (hours) = kWh. Cost = kWh × unit price. Peak and off-peak use is calculated separately.

How to use the appliance electricity cost calculator

Four quick steps to see kWh and running cost per hour, month and year

Enter the wattage

Use the label value or choose a typical appliance.

Set daily use

Enter hours and minutes, plus days used each month.

Use your tariff

Copy the unit price from your electricity bill.

Read the result

Compare hourly, daily, monthly and annual kWh and cost.

How much electricity do appliances use and cost to run?

Examples use 26.11p/kWh; enter the unit rate from your own bill for a personal estimate

Air conditioner electricity use

A 1.2 kW unit running for 6 hours uses up to 7.2 kWh before cycling and efficiency are considered.

Electric heater running cost

A 2 kW heater uses 2 kWh for every full-power hour. A thermostat can reduce actual running time.

Tumble dryer cost per cycle

Heat-pump dryers usually use less electricity than vented or condenser models. Use the energy-label kWh per cycle where available.

Heat pump electricity consumption

Weather, flow temperature, COP and insulation matter more than the maximum input printed on the unit.

Immersion heater cost

Enter actual heating time, not all the hours the cylinder remains switched on.

Fridge electricity use

The compressor runs intermittently; annual kWh on the energy label is the best benchmark.

Why can the estimate differ from my bill?

An appliance label often shows maximum or rated input, while real power changes during a cycle. This calculator excludes fixed standing charges because they are not caused by one appliance. For the best result, enter your bill’s unit rate and measured average wattage.

Price source: Ofgem price cap, 1 July–30 September 2026. Check the current Ofgem energy price cap.

Appliance electricity cost questions

Straight answers about appliance wattage, kWh, Economy 7 and electricity running costs

How do I calculate an appliance’s electricity cost?

Divide watts by 1000, multiply by hours used, then multiply kWh by your unit price.

How much does a 2 kW heater cost per hour?

At 26.11p/kWh, a 2 kW heater costs about 52p for one full-power hour.

How much electricity does a heat pump use?

There is no single figure. Weather, COP, water temperature and home heat loss all affect consumption.

Does a fridge use its rated watts all day?

No. Its compressor cycles. The annual kWh figure on the energy label is usually more useful.

How do peak and off-peak rates work?

The calculator prices energy used in each period separately, then adds the totals.

Does the calculator include standing charges?

No. Fixed daily charges are excluded because running one appliance does not create them.

Is my data stored?

No. Calculations run in your browser and the entered values are not sent to our server.

What is the most accurate way to measure appliance electricity use?

Use a plug-in energy monitor over a representative day or full programme, then enter the measured average watts. For fridges, freezers and other cycling appliances, the annual kWh figure on the energy label is often a better benchmark.

Which electricity price should I enter?

Use the electricity unit rate including VAT from your bill, not the daily standing charge. If you have Economy 7 or another time-of-use tariff, enter each period separately in two-rate mode.