Power
Watts show how quickly an appliance uses electricity. Divide watts by 1,000 to convert them to kilowatts.
2,000 W ÷ 1,000 = 2 kW
Household power desk
What is using your electricity?
Turn watts and usage time into pounds and pence. No sign-up, no hidden assumptions.
Running cost
Appliance calculator
Choose a typical appliance or enter the wattage shown on its label.
Estimated yearly cost
£42.92
Per day used12p
Per month£3.58
Energy / year175.2 kWh
Five-year cost£214.62
Based on 4 hours a day, 7 days a week.
Side by side
Compare two options
Compare appliances that do the same job, using one typical session.
Difference per use
Save 34p
Option A uses 75% less electricity for this session.
At-home charging
EV charging calculator
Estimate energy drawn from the wall, including charging losses.
Cost per charge
£9.80
From the wall40.0 kWh
Into battery36.0 kWh
Per month£39.20
Per year£470.40
Actual losses vary with the car, charger, temperature and battery conditions.
Quiet consumption
Standby drain calculator
See what always-on devices could add to your bill.
Estimated yearly cost
£42.92
Combined draw24 W
Per month£3.58
Energy / year175.2 kWh
Per device / year£5.37
Only switch off equipment where the manufacturer says it is safe to do so.
Per cycle
Laundry cost calculator
Estimate the electricity used by a washing machine or tumble dryer.
Cost per cycle
18p
Energy / cycle0.75 kWh
Per week92p
Per month£3.98
Per year£47.78
Machine power varies during a cycle. For the best estimate, use the kWh-per-cycle figure on the energy label.
Estimates include electricity only. Results are rounded; your bill may also include standing charges and taxes.
Read the label
Three numbers tell the story.
Time
Multiply kilowatts by the hours used. A 2 kW heater running for 30 minutes consumes 1 kWh.
2 kW × 0.5 h = 1 kWh
Tariff
Multiply energy by your unit rate. At 24.5p per kWh, that half hour of heating costs 24.5p.
1 kWh × 24.5p = 24.5p
Transparent by design
Useful estimates, without pretending every home is the same.
Every result uses the same open formula: power in kilowatts × time in hours × your electricity rate. Preset wattages are illustrative starting points, not claims about a particular product.
For the closest estimate, use the rated watts or kWh-per-cycle figure from your appliance label and the unit rate—not the standing charge—from your energy bill. Thermostatically controlled appliances cycle on and off, so a plug-in energy monitor can provide a better real-world average.
Calculation method reviewed September 2026 · Prices are not financial advice
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