Electricity Bill Calculator
Track multiple appliances and estimate your electricity costs with US state average rates
How Electricity Costs Are Calculated
Electricity is measured in kilowatt-hours (kWh). To find daily usage, multiply the appliance wattage by hours used, then divide by 1,000. Multiply by your rate per kWh to get the cost. The US national average rate is approximately $0.16/kWh (2025), but rates vary significantly by state, from $0.10/kWh in Louisiana to $0.43/kWh in Hawaii.
Frequently Asked Questions
How do I calculate my monthly electricity cost for a specific appliance?
Choose your appliance from the preset list or enter its wattage manually, set how many hours per day you use it, and select your state’s electricity rate. The calculator multiplies: (Watts / 1000) x Hours x Days x $/kWh to give you the monthly cost. Add multiple appliances to see the total household estimate.
What is the average electricity rate per kWh in the US?
The US national average is around $0.17 per kWh, but rates vary widely by state. Hawaii is the most expensive at about $0.43/kWh, while Louisiana and Oklahoma often run below $0.10/kWh. The calculator includes a dropdown with current average rates for all US states so you can use your actual rate.
How many kWh does a refrigerator use per month?
A typical modern refrigerator uses about 100-150 watts continuously, which works out to roughly 72-108 kWh per month. Older models can use twice as much. At the national average of $0.17/kWh, a new fridge costs roughly $12-18 per month to run. Enter your exact model’s wattage from the appliance label for a precise estimate.
Why is Hawaii's electricity rate so much higher than other states?
Hawaii generates most of its electricity by burning imported oil, which is far more expensive than coal, natural gas, or the hydropower available in mainland states. The transportation cost of shipping fuel to the islands also adds significantly to the price, making Hawaiian rates roughly 2-3 times the national average.
How do I reduce my electricity bill using this calculator?
Add all your major appliances to see which ones cost the most each month. Targets with high wattage and long daily runtime are where cuts pay off most. For example, replacing an old 5,000-watt electric water heater with a heat pump model can cut that appliance’s cost by 60-70%. The calculator makes it easy to compare before and after scenarios.