Add the requested inputs
Use the labelled fields in the workspace above. If example values are provided, try them first or replace them with your own.
Home & lifestyle · Free online tool
Electricity cost calculator
Estimate appliance electricity use and running cost from power, usage time, duty cycle and tariff. Compare the likely kWh and cost of appliances or usage patterns over a chosen number of days.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
Electricity cost calculator workspace
Runs locally in your browser
Enter tariff values in the selected currency. A standing charge is applied once per day, not once per appliance.
Result
Total period cost—
Period energy use—
Usage cost—
Standing charges—
Annual projection—
Daily energy use—
Annual energy use—
Effective power—
Use it with confidence
How to use the electricity cost calculator.
Calculate and review
Use the main action when needed. kWh = watts ÷ 1,000 × quantity × hours per day × days × duty cycle. Energy cost is kWh × tariff; the optional standing charge is added once per day.
Try a worked example
A 1,000 W appliance used for two hours a day over 30 days consumes about 60 kWh at a 100% duty cycle.
Check the assumptions
Standing charges normally apply to the whole supply, not each appliance. Real devices cycle or vary their power and tariffs can change.
Checked sources
Official guidance behind this tool.
Energy price cap unit rates and standing charges
Ofgem's average Direct Debit electricity rate for 1 July to 30 September 2026 is 26.11p per kWh. Regional, payment-method and individual tariff rates differ, so use the figure on your bill when available.
Reference checked 25 July 2026. The source takes priority if guidance changes.
Helpful answers
Electricity cost calculator FAQs.
Is the electricity cost calculator free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this electricity cost calculator work?
kWh = watts ÷ 1,000 × quantity × hours per day × days × duty cycle. Energy cost is kWh × tariff; the optional standing charge is added once per day.
What should I check before using the result?
Standing charges normally apply to the whole supply, not each appliance. Real devices cycle or vary their power and tariffs can change.