Electricity Cost Calculator
Calculate how much an appliance costs to run.
Enter watts, usage hours, and electricity rate to see daily, monthly, and yearly costs.
Electricity Cost
Electricity cost is calculated by converting watts to kilowatts, multiplying by hours of use, then multiplying by your electricity rate.
Daily kWh = (Watts × Hours per Day) / 1,000
Monthly Cost = Daily kWh × 30 × Price per kWh
Average electricity rates (2025):
- US average: $0.16/kWh
- UK average: £0.28/kWh
- EU average: €0.25/kWh
Common appliance wattages:
- LED bulb: 8–12 W
- Laptop: 30–70 W
- Desktop PC: 100–300 W
- Refrigerator: 100–250 W
- Window AC: 500–1,400 W
- Space heater: 1,000–1,500 W
- Washing machine: 400–500 W
- Electric oven: 2,000–5,000 W