Electricity Cost / kWh Calculator
Calculate how much electricity an appliance uses per month and what it costs.
Enter watts, hours per day, and your electricity rate.
Electricity Usage & Cost
Electricity cost is calculated by converting watts to kilowatt-hours and multiplying by your rate.
kWh per day = (Watts × Hours per day) / 1,000
kWh per month = kWh per day × 30
Monthly cost = kWh per month × Rate per kWh
Common appliance wattages:
- LED light bulb: 10 W
- Laptop: 50 W
- Refrigerator: 150 W
- Window AC unit: 1,200 W
- Space heater: 1,500 W
- Electric oven: 2,500 W
Average electricity rates (2025):
- US average: $0.16/kWh
- UK average: £0.28/kWh
- EU average: €0.25/kWh
- Australia average: A$0.30/kWh