How to Calculate Your Electricity Cost (and Lower Your Bill)
Electricity cost is the price you pay for electrical energy consumed in your home, measured in kilowatt-hours (kWh). To calculate the cost of running any device, multiply its wattage by hours of use, divide by 1,000 to convert to kWh, then multiply by your electricity rate. The average U.S. household pays 18.05 cents per kWh and spends about $145 per month on electricity.
Quick Answer
- 1. Formula: Cost = (Watts x Hours) / 1,000 x Rate per kWh. A 1,500W heater running 8 hours at $0.18/kWh costs $2.16/day.
- 2. U.S. average rate: 18.05 cents/kWh (March 2026), up 5.4% from 2025 (EIA).
- 3. Average household usage: 843 kWh/month, costing approximately $145.33/month.
- 4. Rates range from 12.44 cents/kWh (Louisiana) to 39.89 cents/kWh (Hawaii).
Calculate your electricity cost
Enter your appliance wattage, hours of use, and rate per kWh to see daily, monthly, and yearly costs.
Electricity Cost Calculator - FreeThe Electricity Cost Formula
Calculating electricity cost is straightforward once you understand three numbers: the device's wattage, how many hours it runs, and your electricity rate.
Cost = (Watts x Hours of Use) / 1,000 x Electricity Rate ($/kWh)
The division by 1,000 converts watts to kilowatts, since electricity is billed per kilowatt-hour (kWh). One kWh equals 1,000 watts of power used for one hour.
Example: A 1,500-watt space heater running 8 hours per day at the national average rate of $0.1805/kWh costs: (1,500 x 8) / 1,000 x $0.1805 = $2.17 per day, or about $65 per month. That single appliance accounts for nearly half the average electric bill.
How to Find Your Electricity Rate
Your electricity rate appears on your monthly utility bill, usually listed as a per-kWh charge. However, your bill may include multiple rate components:
- Generation charge: The cost of producing the electricity (typically 50 to 60 percent of your total rate).
- Transmission charge: The cost of moving electricity from power plants to your local utility (typically 10 to 15 percent).
- Distribution charge: The cost of delivering electricity from the local grid to your home (typically 20 to 30 percent).
- Fixed charges: Monthly service fees that do not vary with usage (typically $5 to $20).
For calculation purposes, divide your total bill by your total kWh usage to get your effective or blended rate. This accounts for all components.
Average Electricity Rates by State (2026)
Electricity rates vary by more than 3x across U.S. states, driven by differences in fuel sources, regulation, infrastructure costs, and climate. Here are select state rates as of March 2026:
| State | Rate (cents/kWh) | vs. National Avg |
|---|---|---|
| Louisiana | 12.44 | -31% |
| Idaho | 12.80 | -29% |
| Texas | 14.50 | -20% |
| Florida | 16.20 | -10% |
| National Average | 18.05 | -- |
| New York | 24.30 | +35% |
| California | 32.00 | +77% |
| Massachusetts | 34.50 | +91% |
| Connecticut | 36.20 | +101% |
| Hawaii | 39.89 | +121% |
What Uses the Most Electricity in Your Home?
Understanding where your electricity goes is the first step to reducing your bill. Here is a typical breakdown for an American household:
- Heating and cooling (40-50%): Central air conditioning, heat pumps, and electric furnaces dominate electricity use, especially in hot climates and cold winters.
- Water heating (14%): Electric water heaters use 4,000 to 5,500 watts and run for several hours daily.
- Appliances (13%): Refrigerators run 24/7 (using 100 to 400 kWh per month), plus washers, dryers, and dishwashers.
- Lighting (9%): Average homes have 30 to 40 light fixtures. LED upgrades can cut this category by 75 percent.
- Electronics (7%): TVs, computers, game consoles, and chargers.
- Other (10-15%): Cooking, fans, pool pumps, and standby power draw.
How to Calculate Costs for Common Appliances
Here is what popular household appliances cost to run at the national average rate of 18.05 cents per kWh:
| Appliance | Typical Wattage | Daily Cost (8 hrs) | Monthly Cost |
|---|---|---|---|
| Space heater | 1,500W | $2.17 | $65.10 |
| Central AC | 3,500W | $5.05 | $151.60 |
| Electric oven | 2,500W | $3.61 | $108.38 |
| Clothes dryer | 5,000W | $7.22 | $216.75 |
| Refrigerator | 150W (avg) | $0.65 (24 hrs) | $19.53 |
| LED TV (55 inch) | 80W | $0.12 | $3.47 |
| Desktop computer | 200W | $0.29 | $8.67 |
| LED light bulb | 10W | $0.01 | $0.43 |
10 Proven Ways to Lower Your Electricity Bill
1. Adjust Your Thermostat
The Department of Energy estimates that setting your thermostat back 7 to 10 degrees F for 8 hours per day (while sleeping or at work) can save up to 10 percent on annual heating and cooling costs. A programmable or smart thermostat automates this.
2. Switch to LED Bulbs
LED bulbs use 75 to 80 percent less energy than incandescent bulbs and last 25 times longer. Replacing all bulbs in a home can save $100 to $200 per year.
3. Seal Air Leaks
Air leaks around windows, doors, and ductwork force HVAC systems to work harder. Sealing these gaps with weatherstripping and caulk can reduce heating and cooling costs by 10 to 20 percent.
4. Use Energy-Efficient Appliances
ENERGY STAR certified appliances use 10 to 50 percent less energy than standard models. When replacing an old appliance, the energy savings often offset the higher purchase price within 2 to 3 years.
5. Wash Clothes in Cold Water
About 90 percent of the energy used by a washing machine goes to heating water. Switching to cold water for all laundry loads can save $60 to $100 per year.
6. Unplug Phantom Loads
Devices plugged in but not in use (TVs, chargers, game consoles) draw standby power that can add up to 5 to 10 percent of your total electricity bill. Use power strips to easily disconnect groups of devices.
7. Optimize Your Water Heater
Lower the water heater temperature from 140 degrees F to 120 degrees F. Each 10-degree reduction saves 3 to 5 percent on water heating costs.
8. Use Ceiling Fans Strategically
Ceiling fans use only 15 to 75 watts, compared to thousands of watts for AC. In summer, set fans to blow air downward, allowing you to raise the thermostat by 4 degrees without losing comfort.
9. Take Advantage of Time-of-Use Rates
If your utility offers time-of-use pricing, shift energy-intensive activities (laundry, dishwasher, EV charging) to off-peak hours when rates are 30 to 50 percent lower.
10. Consider Solar Panels
Residential solar can eliminate 50 to 100 percent of your electricity bill. See our solar panel calculator to estimate system size and savings for your home.
Why Electricity Rates Are Rising
The 2025 to 2026 increase of approximately 5.4 percent in residential electricity rates reflects several converging factors according to the EIA: rising natural gas prices (the primary fuel for U.S. electricity generation), grid modernization investments, increased demand from data centers and electric vehicles, extreme weather infrastructure hardening, and costs associated with the renewable energy transition.
The Bottom Line
Electricity cost comes down to three variables: wattage, hours of use, and your rate per kWh. Understanding this formula lets you identify which appliances and habits are driving your bill and where to make changes. With the national average at 18.05 cents per kWh and rising, even small efficiency improvements compound into meaningful annual savings.
Calculate the cost of running any appliance with our free electricity cost calculator.
Frequently Asked Questions
How much does electricity cost per kWh in the US?
As of March 2026, the average residential electricity rate in the United States is 18.05 cents per kilowatt-hour, according to the U.S. Energy Information Administration (EIA). However, rates vary dramatically by state. Louisiana has the cheapest residential electricity at 12.44 cents per kWh (31 percent below the national average), while Hawaii pays 39.89 cents per kWh (over 2.2 times the national average). The EIA projects the 2026 national average at 18.02 cents per kWh, up from 17.29 cents in 2025, representing a 4.2 percent increase.
How many kWh does the average US household use per month?
The average American household uses approximately 843 to 861 kWh of electricity per month, or about 10,260 to 10,332 kWh per year. This translates to roughly 28 to 29 kWh per day. However, consumption varies enormously by state and climate. Louisiana averages 1,192 kWh per month due to high air conditioning demand, while California averages just 491 kWh per month thanks to milder climate and stricter efficiency standards. The average monthly electric bill in the U.S. is approximately $145.33.
What uses the most electricity in a home?
Heating and cooling account for the largest share of residential electricity use, typically 40 to 50 percent of the total bill. Water heating is the second-largest consumer at about 14 percent. After that, major appliances (refrigerator, washer, dryer) account for about 13 percent, lighting about 9 percent, and electronics and computers about 7 percent. The remaining 10 to 15 percent goes to miscellaneous loads like fans, cooking appliances, and standby power for devices that draw electricity even when turned off.
How do I read my electricity bill?
Your electricity bill shows your consumption in kilowatt-hours (kWh) for the billing period, your rate per kWh, and any fixed charges or fees. To verify the bill, subtract the previous meter reading from the current reading to get kWh used, then multiply by your rate. Many utilities have tiered pricing where the rate increases as you use more electricity, time-of-use rates that charge more during peak hours, or demand charges based on your highest usage in any 15-minute interval. Look for a line-by-line breakdown on your bill that separates generation charges, transmission charges, and distribution charges.
Does turning off lights really save money?
Yes, but the amount saved depends on the type of bulb. Turning off a 60-watt incandescent bulb for one hour saves about 1.1 cents (at 18 cents per kWh). Turning off a 10-watt LED bulb for one hour saves about 0.18 cents. The real savings from managing lights come from switching to LED bulbs entirely. An LED bulb uses 75 to 80 percent less energy than an incandescent bulb. Replacing ten 60-watt incandescent bulbs with 10-watt LED equivalents saves roughly $100 per year if the lights run 8 hours per day.
Calculate your electricity cost
Enter an appliance's wattage, hours of use, and your local rate to see daily, monthly, and annual costs.
Electricity Cost Calculator - Free