Enter the appliance wattage in watts (W), your electricity rate per kWh, and how many hours per day you use it. The calculator instantly shows the estimated cost per day, week, month, and year.
The wattage is printed on the appliance label or in the spec sheet. Your electricity rate is on your bill — the EU average is around €0.25/kWh, while the US average is around $0.16/kWh in 2024. Rates vary by country, region, and tariff.
Formula: cost = (watts ÷ 1000) × hours per day × price per kWh
Common appliance cost examples
| Appliance |
Wattage |
Daily use |
Est. monthly cost (€0.25/kWh) |
| LED bulb |
10 W |
5 h |
~€0.38 |
| Wi-Fi router |
15 W |
24 h |
~€2.70 |
| Television |
120 W |
4 h |
~€3.60 |
| Fridge |
150 W |
24 h |
~€27.00 |
| Washing machine |
2 000 W |
1 h |
~€15.00 |
| Electric heater |
2 500 W |
4 h |
~€75.00 |
These are estimates. Actual consumption varies with appliance efficiency, ambient temperature, and usage cycles.
How to reduce your electricity bill
- Choose appliances rated A or above in energy efficiency.
- Use electric heaters only when needed — they are the biggest driver of high electricity bills.
- Your fridge runs 24 h a day: an efficient model saves noticeably over a full year.
- Turn off standby devices — a TV on standby can draw 10–30 W continuously.
How to find your kWh rate
Your rate per kWh is shown on your electricity bill, usually as "price per kWh" or "unit rate". If you are on a time-of-use tariff, use your peak rate for a conservative estimate.
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