Electricity Cost Calculator
Enter a device's power in watts, how long it runs each day and your price per kWh to see the daily, monthly and yearly cost. Find out which appliances are quietly driving your bill up.
Electricity Cost
What a device costs to run per year
How it works
- kWh per day = watts × hours ÷ 1,000.
- Standby power across a home can add 5–10% to a bill.
- Heating and cooling devices dominate: a 2,000 W heater costs as much in one hour as a LED bulb in two weeks.
- Check the label or a plug-in energy meter for the real wattage — 'max' ratings overstate typical use.
Worked example: a 2,000 W heater, 4 hours a day, €0.30/kWh
- 1Daily use: 2,000 × 4 ÷ 1,000 = 8 kWh.
- 2Daily cost: 8 × 0.30 = €2.40.
- 3Yearly: 2.40 × 365 = €876 if used every day.
€2.40 per day · €72 per month · €876 per year
What common appliances cost per hour (€0.30/kWh)
| Appliance | Typical power | Cost per hour |
|---|---|---|
| LED bulb | 9 W | €0.003 |
| Laptop | 50 W | €0.015 |
| Fridge (average) | 100 W | €0.03 |
| Dishwasher cycle | 1,800 W | ≈ €0.54 per cycle |
| Tumble dryer | 2,500 W | €0.75 |
| Electric heater | 2,000 W | €0.60 |
Fridges and freezers cycle on and off — their average draw is much lower than the rated power.
Frequently asked questions
Where do I find my price per kWh?
It is printed on your electricity bill, usually as a unit rate in cents or pence per kWh.
How do I calculate kWh from watts?
Multiply watts by hours of use and divide by 1,000. A 100 W device running 10 hours uses 1 kWh.
Which appliances use the most electricity?
Anything that heats: electric heating, water heaters, tumble dryers, ovens and kettles. Cooling (air conditioning, old fridges) comes next.
Do devices on standby really cost much?
Individually little — a few watts each — but a house full of standby devices can total 50–100 W continuously, which is €130–€260 per year at €0.30/kWh.
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QuickCalc Pro is a one-time $4.99 payment: no ads anywhere, and you can save any calculation and open it again on any device.
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