Electricity Cost Calculator
Calculate daily, monthly, and yearly electricity costs from device wattage, usage hours, and your electricity rate.
Daily Cost—
Monthly Cost (30 days)—
Yearly Cost (365 days)—
Total kWh (for entered days)—
How to Calculate Electricity Cost
Daily Cost = (Watts × Hours per Day / 1000) × Price per kWh
Convert watts to kilowatts, multiply by hours of daily use to get daily kWh, then multiply by your electricity rate to get the daily cost.
Monthly and Yearly Projections
Monthly = Daily Cost × 30 | Yearly = Daily Cost × 365
Example:
A 1,500W space heater, 8 hours/day at $0.12/kWh:
Daily kWh = 1500 × 8 / 1000 = 12 kWh
Daily cost = 12 × $0.12 = $1.44/day
Monthly = $1.44 × 30 = $43.20/month
Yearly = $1.44 × 365 = $525.60/year
A 1,500W space heater, 8 hours/day at $0.12/kWh:
Daily kWh = 1500 × 8 / 1000 = 12 kWh
Daily cost = 12 × $0.12 = $1.44/day
Monthly = $1.44 × 30 = $43.20/month
Yearly = $1.44 × 365 = $525.60/year
FAQ
What's the average electricity rate in the US?
The national average is approximately $0.12–$0.16 per kWh, but rates vary widely by state — from $0.08 in some areas to over $0.30 in others.
How can I reduce electricity costs?
Use energy-efficient appliances (look for ENERGY STAR ratings), reduce usage hours, switch to LED lighting, and use smart power strips to eliminate phantom loads.
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Last updated: 2026-08-08