Input Parameters
About This Calculator
- Daily kWh = W × hours / 1000
- Monthly cost = kWh × days × rate
- Yearly = monthly × 12
How this electricity cost calculator works
Enter your device wattage, daily usage hours, and local electricity rate. The calculator estimates your daily, monthly, and annual costs.
Formula: Cost = Power(W) × Hours × Rate($/kWh) / 1000
FAQ
How to calculate electricity cost?
W × hours × rate / 1000. 100W × 8h × $0.12 = $0.096/day.
Average US electricity rate?
About $0.15/kWh, varying $0.10–$0.30 by state.
Cost of 1500W heater?
1.5kW × 8h × $0.15 = $1.80/day, ~$54/month.