Electricity Cost Calculator
Calculate electricity costs for appliances and devices
Calculator
US average: $0.12/kWh. Check your utility bill for your rate.
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Energy Saving Tips
- Switch to LED bulbs - they use 75% less energy than incandescent
- Unplug devices when not in use - standby power adds up
- Run appliances during off-peak hours for lower rates
- Set AC to 78°F (26°C) in summer to reduce cooling costs
- Use a smart power strip to eliminate phantom loads
How to Use
Calculate electricity costs
Enter wattage
Input device power consumption in watts
Enter usage
Input hours used per day
Enter rate
Input your electricity rate per kWh
View costs
See daily, monthly, and yearly costs
Electricity Cost Formula
kWh = Watts × Hours / 1000 Cost = kWh × Rate per kWh
Convert watts to kilowatts, multiply by hours for energy, multiply by rate for cost.
Frequently Asked Questions
Cost = (Watts × Hours used × Days) / 1000 × Rate per kWh. A 100W bulb used 8 hours/day at $0.12/kWh: (100 × 8 × 30) / 1000 × 0.12 = $2.88/month. Convert watts to kilowatts by dividing by 1000.
kWh measures energy used over time. 1 kWh = 1000 watts used for 1 hour. A 100W device running 10 hours uses 1 kWh. Your electric bill charges per kWh, typically $0.10-$0.30 depending on location.
Heating/cooling (HVAC): 40-50% of bills. Water heater: 15-20%. Washer/dryer: 10-15%. Refrigerator: 5-10%. Other appliances and electronics make up the rest. Focus efficiency efforts on big consumers.
Use LED bulbs (80% less energy), adjust thermostat (1°F = 3% savings), unplug idle devices (vampire draw), use efficient appliances (Energy Star), wash clothes in cold water, air dry when possible, and use smart power strips.