KWh cost calculator: how much does electricity cost per kWh?

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The electricity that’s used in UK homes and businesses is measured in kilowatt hours (KWh). When you look at your energy bill, and when you’re comparing different tariffs, you’ll also see prices listed in terms of kWh. Understanding exactly what a kWh is, and how much it costs, should help you to keep a handle on your energy usages and your monthly outgoings.
Last update: March 2021

kWh cost calculator

If you don’t know how much energy you use at the moment, or how much your energy company charges for each kWh you use, calculating the cost of your energy is crucial. Here, we take a closer look at how you can calculate the kWh cost to your home and how you can measure the amount of energy your household is really consuming.

How to calculate kWh cost?

The easiest way to work out how much you pay for each kWh of energy you use is to look at your monthly bill. This should clearly list the cost of each kWh as well as the other fees charged by your energy company.

If you’re on a fixed rate tariff, the amount you pay for each kWh should stay the same for the duration of your contract. This means that, although your energy bill will go up and down depending on your monthly usage, the unit price will stay the same. This can make it easier to budget and keep control of your finances.

If you’ve opted for a variable rate, the amount you pay for a kWh of electricity will fluctuate. If your energy provider doesn’t list the price of a kWh on your bill, you can calculate the cost of a kWh by dividing the amount you’ve been charged by the number of kWh you’ve used – after taking off any standing charges and fees.


More than ever, our team of experts remain on deck to help you make savings on your energy. We understand how deeply the lives of many are affected by these trying times and we want to support you the best we can. More on your energy supply during COVID-19 in our article.

Calculating the cost of your kWh energy consumption

As well as checking the average energy price you pay for a kWh, it’s important to take a look at your appliances to see how much energy they consume. Most household appliances will list their wattage in the instructions or on a label of the device. You can use this information to calculate the kWh cost of the appliance.

A kWh is the amount of energy you would use if you kept a 1,000 watt appliance on for an hour. So if you have a 1,000 watt electric radiator, it will cost you 1 kWh for every hour it’s switched on. However, if you have a 500 watt vacuum clean, it would take you two hours to consume 1 kWh of energy.
Some of the most energy-hungry appliances found in the home are:

  • Central heating
  • Fridge freezer
  • Tumble dryer
  • Washing machine
  • Oven
  • Kettle
  • Toaster

Is electricity expensive in UK?

Electricity in the UK is relatively expensive compared to other countries around the world. This is due to a number of factors. For a start, most of the countries with cheaper energy have plentiful supplies of oil and gas. We also pay slightly more because UK households contribute a lot towards green energy schemes and other carbon levies.

However, UK energy prices are comparable with those in other European countries. When you calculate the cost of a kWh, electricity in the UK is actually cheaper than some of our neighbours including Germany, Denmark and Ireland.

The list below shows how energy prices in the UK stack up to the rest of the world.

  • Kuwait – $0.03
  • Saudi Arabia – $0.05
  • China – $0.08
  • USA – $0.15
  • France – $0.21
  • UK – $0.26
  • Ireland – $0.28>/li>
  • Denmark – $0.33
  • Germany – $0.38


How did kWh prices evolve over time?

Like all commodities, the cost of electricity fluctuates over time. While prices have dipped occasionally in recent years – most notably after the 2008 financial crisis – in general, the cost of a kWh has been steadily going up. For example, in 2004, households paid an average of 8.9p for a kWh of electricity. Just four years later in 2008, that had risen to 13.2p and by 2014, it was up to 14.5p. That’s a significant increase of 63% in just ten years.

Average annual bill per region

The cost of electricity can vary considerably depending on which region you live in. This is why energy providers always ask for your postcode before showing you the tariffs available. The table below highlights the regional price differences in dual fuel energy bills.

Region Cheapest dual fuel deal available
East Anglia £807
East Midlands £809
London £829
North East £799
North West £826
Scotland £823
South East £838
South West £842
Wales £850
West Midlands £812
Yorkshire-Humberside £792

Here are just a few reasons why energy prices change depending on your location.

  • Supply and demand – how much demand is there for electricity in your area?
  • Energy generation – is electricity generated in your area?
  • DNO charges – how much does your Distribution Network Operator charge your supplier for electricity in your area?

Would you like to know more about energy in the UK? Great! Here are some related articles

  1. Energy consumption
  2. KWh

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Written by eleanor

Updated on 31 Mar, 2021


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