Heating and cooling
Air conditioner
Estimate how much an air conditioner costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Independent calculation utility
See what your appliances cost to run
Enter the power, how long you use it and your electricity unit rate. Get an instant estimate for each use, day, month and year.
- No account required
- Your basket stays in this browser
- Transparent formulas
Instant estimate
Calculate the running cost
Example values — replace these with the figures from your appliance.
Your estimate
Custom appliance results
Calculation breakdown
This estimate uses your electricity unit rate. It does not allocate your daily standing charge to individual appliances.
Start here
Popular calculators
Use an appliance-specific example or open the flexible general calculator.
Heating and cooling
Electric heater
Estimate how much an electric heater costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Heating and cooling
Dehumidifier
Estimate how much a dehumidifier costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Kitchen
Air fryer
Estimate how much an air fryer costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Kitchen
Fridge freezer
Estimate how much a fridge freezer costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Laundry and cleaning
Tumble dryer
Estimate how much a tumble dryer costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Simple and checkable
How it works
- 1
Find the energy figure
Use watts, kWh per cycle, daily kWh or annual kWh from the label, manual or a representative measurement.
- 2
Add usage and tariff
Enter how often the appliance runs and the electricity unit rate in pence per kWh, excluding standing charge.
- 3
Review and save
Check the breakdown, compare options, or add the result to a local household report.
Flagship tool
Your household basket
Combine appliances, edit assumptions, change one tariff across the basket and see monthly and annual totals. Export CSV or JSON, and print a report without creating an account.
Build my basketTwo options
Compare appliances
Normalise different energy formats to annual kWh, see the five-year running-cost difference and add either option to your basket.
Open comparison tool →Purchase decision
Replacement payback
Test whether estimated annual savings recover purchase, delivery, installation, disposal and maintenance differences.
Calculate payback →Calculator category
Heating and cooling
Estimate the electricity used by appliances that heat, cool or manage moisture in your home.
Heating and cooling
Air conditioner
Estimate how much an air conditioner costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Heating and cooling
Portable air conditioner
Estimate how much a portable air conditioner costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Heating and cooling
Electric heater
Estimate how much an electric heater costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Calculator category
Kitchen
Compare the running cost of everyday cooking, refrigeration and dishwashing appliances.
Kitchen
Air fryer
Estimate how much an air fryer costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Kitchen
Electric oven
Estimate how much an electric oven costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Kitchen
Microwave
Estimate how much a microwave costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Calculator category
Laundry and cleaning
Calculate estimated costs per load, session, month and year for cleaning appliances.
Laundry and cleaning
Tumble dryer
Estimate how much a tumble dryer costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Laundry and cleaning
Washing machine
Estimate how much a washing machine costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Laundry and cleaning
Iron
Estimate how much an iron costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Calculator category
Entertainment and office
Understand the running costs of televisions, consoles, computers and home-office equipment.
Entertainment and office
Television
Estimate how much a television costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Entertainment and office
Gaming console
Estimate how much a gaming console costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Entertainment and office
Laptop
Estimate how much a laptop costs to run in the UK using its energy use, your usage and electricity unit rate. See daily, monthly and annual costs.
Learn the method
Latest practical guides
Practical guide
How to find your electricity unit rate
Look on your electricity bill or tariff for “unit rate”, “unit price” or “p/kWh”. Enter that number in the calculators, but do not add the daily standing charge.
Practical guide
Watts, kilowatts and kWh explained
Watts and kilowatts describe power at a moment; kilowatt-hours describe energy accumulated over time. Running cost is energy in kWh multiplied by the tariff.
Practical guide
How to read an appliance energy label
Use the label’s kWh figure with the period or test basis printed beside it. A letter class alone does not tell you the household running cost.
Practical guide
Nameplate wattage vs real energy use
Nameplate wattage describes rated input or a maximum condition. Real average energy may be lower when equipment cycles or idles, but can vary with mode and workload.
Practical guide
Air fryer vs oven running cost
Compare the energy for the same cooking task, including preheating and repeat batches. A smaller air fryer may use less per batch, but it is not automatically cheaper for every quantity or recipe.
Practical guide
Fan vs portable air conditioner cost
A fan commonly draws much less electricity, but it moves air rather than actively lowering room temperature. Compare cost and the different comfort outcome, not wattage alone.
Calculation transparency
The assumptions remain visible
Every result includes the actual arithmetic and links to a methodology covering annualisation, duty cycle, tariff entry, standing-charge exclusion and rounding.
Read the methodologyOptional calculator updates
The tools remain fully available without an email address. If you want occasional updates, this single Netlify form is optional.
Common questions
Frequently asked questions
How accurate is the calculator?
It applies transparent formulas to your figures. Actual use varies with the appliance, settings, cycling and behaviour.
Do I need an account?
No. The calculator works immediately and the basket is stored locally in your browser.
Does it include standing charge?
No. Appliance estimates use the electricity unit rate and keep the daily standing charge separate.
Can I compare appliances with different labels?
Yes. The comparison tool normalises watts/time, cycle and annual-energy inputs to annual kWh.
Can I save a report as PDF?
Yes. Use the print action in the basket or planner and choose Save as PDF in your browser.