Electricity Cost Calculator

How does this electricity cost calculator work?

An electricity cost calculator turns what your appliances draw into kilowatt hours (kWh), and then into money. This one handles a whole list of devices, not just one. First, you pick a tariff for the USA, the UK, Germany or Türkiye. Then you edit a sample household list, which already holds a fridge, a washer, a TV and other common devices.

Each device takes one of three inputs:

• watts with hours per day, days per week and months per year,
• the kWh per year printed on the energy label,
• kWh per cycle for washers, dryers and dishwashers.

After that, the result shows cost per day, month and year, total kWh, CO2 and the share of standby. The table ranks your biggest users, and the tips put a price on the easiest savings. Everything runs in your browser, and your list stays on your device. For EV owners, the EV charging cost calculator prices a charge in the same way.

How do you calculate kWh from watts?

The U.S. Department of Energy gives a simple rule: multiply the wattage by the hours of use per day, then divide by 1,000. The answer is kWh per day. For example, a 100 W TV that runs 4 hours a day uses 0.4 kWh a day, or 146 kWh a year.

Next, multiply the kWh by your price. At the US average of 18.31¢, that TV costs about $26.73 a year before standby. In the UK, at 26.32p, the same TV costs about £38.43.

The calculator adds three details that the basic rule skips. First, days per week and months per year cover devices you only use at weekends or in one season. Second, the quantity field multiplies identical devices, such as six LED bulbs. Third, standby power fills the hours when a device is off but plugged in. To convert other units, such as BTU per hour to watts, try the unit converter.

What does electricity cost per kWh in the US, UK and Germany?

Prices differ a lot between countries. For that reason, the calculator starts from a dated official average for each one:

• USA: the EIA puts the residential average for July 2026 at 18.31¢ per kWh. State prices vary widely around it.
• UK: the Ofgem price cap from 1 October to 31 December 2026 sets 26.32p per kWh and a 54.83p daily standing charge, on average, for Direct Debit customers.
• Germany: BDEW reports an average household price of 37.0 cents per kWh in 2026 so far.
• Türkiye: the EPDK residential single-rate tariff from April 2026 comes to about 3.21 lira per kWh with taxes.

However, your own bill beats any average. Look for the unit rate or energy charge per kWh and type it into the price field. If the bill also lists a fixed daily or monthly charge, add it in the second field. In the US, the EIA average already includes fixed charges, so leave that field at zero while you keep the average.

Why does a fridge use less than its wattage suggests?

A fridge does not run its compressor all day. A thermostat switches it on and off, so the average draw sits far below the rating plate. In fact, the Department of Energy suggests dividing a refrigerator's plugged-in hours by three to estimate its running time.

That is why the calculator offers a label input. The yellow EnergyGuide label in the US shows kWh per year, and the EU and UK energy label shows kWh per annum. Both figures come from a standard test, so they beat a guess from the wattage.

Washers, dryers and dishwashers work in cycles instead. The current EU label shows kWh per 100 cycles, so divide that number by 100 and choose the cycle input. For instance, 62 kWh per 100 cycles becomes 0.62 kWh per wash. Then enter how many cycles you run each week. Air conditioners also switch on and off; the BTU calculator helps you size one before you estimate its running hours.

How much does standby power cost?

Standby power is the small draw of a device that waits for a remote, a timer or a network signal. Each device uses little, but the hours add up to 8,760 in a year. For example, 5 W of standby all year uses 43.8 kWh. That costs about $8.02 at the US average and £11.53 at the UK cap rate.

In the EU, Regulation (EU) 2023/826 limits standby and off mode to 0.5 W for most household products from 9 May 2025. Standby with a status display may use up to 0.8 W. Still, older devices, set top boxes and games consoles in a quick start mode often draw more. A plug-in energy meter shows the real figure in a few seconds.

The calculator counts standby for every hour a device does not run. As a result, the standby share in the result shows how much of your bill goes to waiting. A switchable power strip then removes most of it.

Which appliances use the most electricity at home?

Anything that makes heat or cold usually tops the list. In the examples on this page, a 1,500 W space heater used 4 hours a day for four months needs 730 kWh a year. A tumble dryer with three loads a week needs about 395 kWh. By contrast, a Wi-Fi router uses 87.6 kWh, even though it never switches off.

Run time matters as much as wattage. A kettle draws a lot of power, but it only runs for minutes each day. Meanwhile, a router draws 10 W for all 8,760 hours. The ranking table sorts your devices by kWh per year, and the bar under each name shows its size next to the largest one.

In short, start with the top three rows. Cutting one hour a day from the biggest user often saves more than replacing several small gadgets. The percentage calculator then shows how large a saving is compared with your total bill.

How can an electricity cost calculator help you cut your bill?

An electricity cost calculator helps most when you compare options with numbers. The tips next to the table put a price on three of them:

• Switch off standby. The tip shows your yearly standby kWh and what they cost.
• Replace incandescent bulbs. The U.S. Department of Energy says LEDs use at least 75% less energy. A 60 W bulb used 5 hours a day needs 109.5 kWh a year, and the tip takes 75% off that.
• Check the fridge class. On the EU and UK label, class A allows at most 41% of the reference energy and class E up to 100%. So an A model of the same size uses at least 48.75% less than an E model.

In addition, the tip for your biggest user shows what one hour less per day saves. Finally, download the CSV and repeat the check after each change to track your progress.

How can energy firms and retailers use a calculator like this?

People who search for running costs often stand close to a purchase. They may compare a heat pump dryer, a new fridge or a switch to another tariff. Therefore, a calculator on the website of an energy supplier, an installer or an appliance shop answers the question at the right moment.

Talha Aslan and the team build calculators like this one and the content around them. Our SEO consulting helps such pages rank for searches like appliance running costs. Clear visuals also keep visitors on the page; our article on interactive web design elements shows examples. If you need a new site to host the tool, our web design team can build it with you.