Check the appliance label or spec sheet. If you are unsure, start with a preset below.
EU average ~€0.25/kWh. US average ~$0.16/kWh. Check your electricity bill for the exact rate.
How many hours per day the appliance is running on average.
At 100 W for 4 h/day at 0.22/kWh, the appliance uses 0.400 kWh per day.
Formula: cost = (W ÷ 1000) × hours × price per kWh.
| Period | kWh | Cost |
|---|---|---|
| Daily | 0.400 | 0.09 |
| Weekly | 2.80 | 0.62 |
| Monthly | 12.00 | 2.64 |
| Yearly | 146.00 | 32.12 |
Quick presets
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
| 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.
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.
If you use a battery, inverter, RV, or solar setup, use our battery duration calculator to estimate how long your battery will power an appliance.