Electricity Cost Calculator
Calculate electricity costs for your appliances and find energy-saving opportunities.
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Electricity bills arrive monthly but the cost happens appliance by appliance, hour by hour. This calculator breaks your power consumption into individual devices so you can see exactly where the money goes and which swaps save the most. Enter wattage and daily usage for any appliance to get hourly, daily, monthly, and annual cost estimates.
Example Calculation
4 hours/day
Formula
Daily kWh = Watts × Hours per day ÷ 1,000 Daily cost = Daily kWh × Rate ($/kWh) Monthly cost = Daily cost × 30 Annual cost = Daily cost × 365
How Electricity Cost Is Calculated
Utilities bill in kilowatt-hours (kWh). One kWh = 1,000 watts running for one hour. Multiply your appliance wattage by daily hours to get watt-hours, divide by 1,000 for kWh, then multiply by your rate. The US average rate is around $0.16/kWh, but it varies widely by state and provider.
Frequently Asked Questions
Where do I find my electricity rate?
Check your utility bill — it's usually listed as cents per kWh. Rates in the US range from about $0.09 (Louisiana) to $0.29 (Hawaii).
What are the biggest electricity users at home?
HVAC (heating/cooling), water heater, dryer, refrigerator, and EV charging together typically account for 60–70% of home electricity use.
Does vampire draw (standby power) add up?
Yes. The average US home wastes $100–$200/year on devices in standby. Smart power strips can eliminate most of it.
How much does an EV cost to charge vs. gas?
At $0.15/kWh, charging a 75 kWh battery costs ~$11. A comparable gas tank at $3.50/gallon and 30 mpg costs ~$35 for 300 miles.