Electricity Bill Calculator
What each appliance costs to run per hour, day, month and year, with prices for every US state and the UK price cap.
By Syed Mubashir Ali · Last updated
How to Use Electricity Bill Calculator
- 1Choose your US state or UK region to load the local electricity price (and, in the UK, the daily standing charge from the Ofgem price cap), or pick 'Somewhere else' and enter the price from your bill.
- 2Edit the appliance list: each one's wattage, how many you have and the hours a day it runs. Quick-add buttons add common appliances with typical wattages.
- 3Read the monthly and yearly bill, the cost per day and which appliance costs the most.
- 4See each appliance's cost per hour, day, month and year, sorted from most to least expensive.
- 5Open 'What if the price changes?' to see your bill at a different rate. Copy or share the result.
Frequently Asked Questions
How much does it cost to run a space heater?
A 1,500 W heater running 4 hours a day uses 6 kWh, which costs about $1.09 a day or $33 a month at the US average of 18.19¢ per kWh, and about £1.58 a day or £48 a month at the UK price cap of 26.32p.
How much does it cost to run central air conditioning?
A 3.5 kW central AC running 6 hours a day uses 21 kWh: about $116 a month at the US average price, $103 in Texas (16.06¢) and $212 in California (33.25¢).
How much does it cost to run a fridge?
A modern fridge-freezer averages about 50 W across the day (its compressor cycles on and off), or 1.2 kWh a day. That's about $6.64 a month in the US and £9.61 a month (£115 a year) in the UK.
How much does an electric shower or EV charging cost in the UK?
A 9 kW electric shower used for 15 minutes a day uses 2.25 kWh: about 59p a shower, or £18 a month at the price cap. Charging an EV for 1.5 hours a day on a 7 kW home charger costs about £84 a month at the cap rate, much less on an EV tariff.
What is the UK standing charge?
A fixed daily charge for being connected, paid whatever you use. Under the Ofgem price cap for October to December 2026 it's 54.83p a day for electricity, about £200 a year, on top of 26.32p per kWh. There's no VAT on electricity from October 2026 to March 2027.
How do I work out an appliance's running cost?
Watts × hours ÷ 1,000 gives kWh; multiply by your price per kWh. A 100 W TV on for 5 hours uses 0.5 kWh a day, about $2.77 a month at 18.19¢. Find the wattage on the rating plate or in the manual.
Why doesn't this match my bill exactly?
Appliances that cycle (fridges, heaters with thermostats, AC) draw full power only part of the time, tiered or time-of-use tariffs change the price by hour or amount used, and US bills often add a fixed customer charge and taxes. Use it to see where the money goes, then check your price on your bill.
About Electricity Bill Calculator
This electricity cost calculator shows what each appliance in your home costs to run, by the hour, day, month and year, and the monthly bill they add up to. Prices are built in for every US state, from the US Energy Information Administration's latest averages, and for the UK from the Ofgem price cap, including the daily standing charge. Anywhere else, enter your own tariff in any currency.
The list starts with common appliances and you can add others with one tap: central or room air conditioning, space heaters, an electric shower, a tumble dryer, EV charging and more, each with a typical wattage you can edit. Results are sorted by cost, so the appliance driving your bill is at the top, often a heater, AC or something that never switches off rather than the kettle.
A 'what if' field shows your bill if your price changes, useful when a fixed deal is ending or the price cap moves. The figures are estimates: your real bill depends on your tariff, taxes and how long each appliance actually runs.