Utility
Electricity Cost Calculator
Calculate how much it costs to run any device or appliance based on wattage, daily usage hours, and your electricity rate. Add multiple devices for a total estimate.
Device 1
Add your devices and click Calculate
How is this calculated?
Daily kWh = Wattage × Hours/Day ÷ 1000
Monthly kWh = Daily kWh × Days/Month
Yearly kWh = Daily kWh × 365
Daily Cost = Daily kWh × Rate ($/kWh)
Monthly Cost = Monthly kWh × Rate ($/kWh)
Yearly Cost = Yearly kWh × Rate ($/kWh)
Example: 100W device, 8 hrs/day, $0.16/kWh
Daily: (100 × 8) ÷ 1000 = 0.8 kWh = $0.13
Monthly: 0.8 × 30 = 24 kWh = $3.84
Yearly: 0.8 × 365 = 292 kWh = $46.72FAQ
Frequently asked questions about electricity costs
How do I find my electricity rate?
Check your utility bill for the cost per kWh. In the US, the average residential rate is about $0.16/kWh, but it varies from $0.10 to $0.45 depending on your state and utility provider.
How is electricity cost calculated?
Multiply device wattage by hours used per day, divide by 1000 to get kWh, then multiply by your electricity rate. Formula: (Watts × Hours/Day × Days) ÷ 1000 × Rate = Cost.
What uses the most electricity in a home?
HVAC (heating/cooling) typically uses 40-50% of home electricity. Water heaters, dryers, ovens, and refrigerators are other major consumers. A central AC can use 3000-5000 watts.
How much does it cost to run a PC all day?
A typical desktop PC uses 200-500W. At $0.16/kWh running 24 hours: (300W × 24h ÷ 1000) × $0.16 = $1.15/day or about $34.56/month.
Does leaving devices on standby cost money?
Yes, phantom or standby power can account for 5-10% of your electricity bill. A typical home wastes $100-200 per year on standby power from TVs, chargers, and gaming consoles.
How can I reduce my electricity bill?
Use LED bulbs (80% less energy), unplug idle devices, set AC to 78°F in summer, use a smart power strip, run appliances during off-peak hours, and upgrade to Energy Star appliances.