Electricity Cost Calculator for Appliances

Enter an appliance's wattage, daily running time and your electricity rate to see its cost per day, week, month and year.

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Calculate by wattage

Your appliance

Results update as you type

Wattage of appliance (W)

Usage time per day (hours)

Price per kWh (pence)

The starting unit rate is Ofgem’s price-cap rate for GB average, Direct Debit, 1 October 2026 to 31 December 2026 (Ofgem). Use the rate shown on your own tariff if you have it.

Tip:Standing charges aren't included here — they're fixed regardless of appliance use. Use your latest bill's unit rate for the most accurate figure.

Calculate by appliance

Your appliance

Results update as you type

Select an appliance

A rated-power shortcut, not a measured UK average. Check your appliance label or manual where possible.

Usage time per day (hours)

Price per kWh (pence)

Tip:This treats the selected watts as a constant draw for every entered hour. Appliances that cycle, heat up and switch off can use much less than rated power multiplied by the full cycle time; use a published kWh-per-cycle figure where one is available.

Don't know the wattage of your appliance?

Choose an appliance from the selector for an editable starting wattage. For a more accurate result, replace it with the figure on the appliance label or in its manual. For devices that cycle on and off, a plug-in energy monitor gives a better kWh figure than rated power alone.

Frequently asked questions

How do I find the wattage of my appliance?

You can usually find the wattage on a label on the appliance itself, in the user manual, or by searching for the make and model online. If you cannot find the exact wattage, the selector offers an illustrative rated-power shortcut, but it is not a measured UK average.

How much does it cost to run a washing machine?

Use the kWh-per-cycle figure from the machine label or manual with your tariff unit rate where possible. A wattage rating is maximum or rated power, not necessarily the energy used continuously through a cycle, so multiplying it by the full programme time can overstate the cost.

Which household appliances use the most electricity?

Rated power alone cannot answer that. Electricity use depends on both the power actually drawn and how long the appliance draws it; thermostats, duty cycles and programme settings matter. Compare measured kWh over a representative period where possible.

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Written by

Rob Gibbs

Hi, I'm Rob, and I run Energy-Review.co.uk. I initially started this project in 2018 when I was looking to switch energy suppliers and found there wasn't a website that provided simple, data-backed reviews on all the suppliers available. Since then, I have spent a lot of time (too much, some may say!) looking at all publicly available data about each supplier and writing reviews using this information. These reviews are updated as regularly as possible, and any data is backed up by a source where necessary. I have also started writing guides on various energy-related topics, which hopefully you will find useful. If you find any issues, please use our contact form to let us know.