Introduction
James, a homeowner in Houston, opens his June 2026 electricity bill and sees $287. He knows the air conditioner ran a lot during the heat wave, but he has no idea which appliances cost the most. Is it the AC? The refrigerator? The pool pump? The gaming PC his son leaves running 24/7?
The average US residential electricity rate is 18.83 cents per kWh as of April 2026, according to the US Energy Information Administration (EIA) Electric Power Monthly. That is up 7.3% from April 2025. Rates range from 12.35 cents in North Dakota to 46.62 cents in Hawaii. In Texas, where James lives, the average is around 15 cents per kWh. His 1,913 kWh usage means his base energy charge alone is about $287, before taxes and fees. This calculator helps him identify exactly which appliances are driving that number.
Inputs Required
- Appliance Wattage: The power rating in watts, found on the label or in the manual
- Hours Per Day: How long the appliance actually runs at full power
- Days Per Month: How many days per month the appliance is used
- Electricity Rate: Your cost per kWh from your utility bill (US average: 18.83 cents as of April 2026)
Outputs Provided
- Monthly Energy Usage: Kilowatt-hours consumed per month
- Monthly Cost: Dollar cost per month
- Daily Cost: Dollar cost per day
- Annual Cost: Estimated yearly cost
How the Calculation Works
Energy (kWh) = Power (W) / 1000 x Hours Per Day x Days Per Month
Cost = Energy (kWh) x Rate (per kWh)
- Power (W): The wattage rating of the appliance, found on the label or in the manual
- 1000: Converts watts to kilowatts, since utility companies charge per kilowatt-hour, not watt-hour
- Hours Per Day: How long the appliance actually runs, not just how long it is switched on
- Rate: Your electricity tariff, typically found on your utility bill. The US average is 18.83 cents per kWh as of April 2026, but rates vary widely by state and provider
For a deeper understanding of the electrical relationships behind these calculations, try our Ohms Law Calculator. If you are sizing an air conditioner, our BTU Calculator can help you determine the right capacity.
Current Electricity Rates (2026)
The EIA Electricity Monthly Update reports the following average rates as of April 2026:
- Residential: 18.83 cents per kWh (up 7.3% from April 2025)
- Commercial: 13.51 cents per kWh (up 4.8%)
- Industrial: 8.66 cents per kWh (up 5.5%)
- Lowest state: North Dakota at 12.35 cents per kWh
- Highest state: Hawaii at 46.62 cents per kWh
Rates have risen 25% over four years, from 15.04 cents in 2022 to 18.83 cents in 2026. This makes energy efficiency upgrades more cost-effective than ever. For calculating voltage drop in electrical wiring, use our Voltage Drop Calculator.
How to Use the Calculator
- Find the wattage of your appliance on its label, nameplate, or in the user manual
- Estimate how many hours per day the appliance actually runs at full power
- Enter the number of days per month you use it
- Enter your electricity rate per kWh from your utility bill (US average: 18.83 cents)
- Click Calculate to see monthly cost, energy usage, and annual estimate
- For multiple appliances, switch to the Multiple Appliances tab and add each device
Example Calculations
Example 1: Central Air Conditioner
A 3,500 W central AC runs 8 hours per day for 30 days at the US average rate of 18.83 cents per kWh: Energy = 3.5 kW x 8 h x 30 days = 840 kWh. Cost = 840 x $0.1883 = $158.17 per month. Over a 5-month cooling season, that is $791. This is typically the single largest electricity expense in a home.
Example 2: LED vs Incandescent Bulb
A 60 W incandescent bulb used 6 hours per day at 18.83 cents per kWh costs 0.06 kW x 6 h x 30 days x $0.1883 = $2.03 per month. A 10 W LED providing the same light costs $0.34 per month. The LED saves $1.69 per month per bulb, or $20.28 per year. Replace 15 bulbs throughout the house and save $304 annually. At current 2026 rates, the payback period for LED bulbs is under 6 months.
Real-World Scenarios
Identifying the Biggest Energy Hog
Maria, a homeowner in Tampa, enters all her major appliances into the multi-appliance calculator. She discovers her 15-year-old refrigerator uses 350 W on average and costs $47 per month. A new ENERGY STAR refrigerator uses only 120 W, which would cost $16 per month. The savings of $31 per month means the $900 new fridge pays for itself in 29 months. She also discovers her son's gaming PC with a 750 W power supply running 6 hours per day costs $25 per month.
Time-of-Use Rate Optimization
Kevin, a software developer in San Diego, has a time-of-use plan that charges 42 cents per kWh during peak hours (4 PM to 9 PM) and 18 cents off-peak. He runs his dishwasher (1,800 W, 1.5 hours) and electric dryer (3,000 W, 1 hour) during peak hours. By shifting both to off-peak hours, he saves $22 per month. The calculator lets him run the numbers for both rates to see the exact difference.
Evaluating a Heat Pump Upgrade
Linda, a homeowner in Portland, is replacing her electric baseboard heating (1,500 W per room, 4 rooms, 8 hours per day) with a heat pump. Her current heating costs $271 per month during winter. The heat pump uses 1,200 W total for the same square footage, costing $54 per month. The calculator shows she saves $217 per month during the 5-month heating season, or $1,085 per year. With a $4,000 installation cost after rebates, the payback period is 3.7 years.
Why This Calculation Matters
Electricity is often the second or third largest household expense after rent and food. With rates up 25% over four years, small changes in usage habits multiplied across dozens of appliances and 12 months add up to hundreds of dollars per year. This calculator makes those numbers visible so you can act on them.
Common Mistakes to Avoid
- Using maximum wattage instead of actual running wattage: A refrigerator rated at 400 W on the label may only draw 150 W during normal operation. Check energy guide labels or measure with a plug-in energy monitor for accuracy
- Forgetting standby power: Many devices draw power even when turned off. TVs, game consoles, and chargers in standby can add up to 10% of a household bill
- Using the wrong electricity rate: The US average is 18.83 cents per kWh as of April 2026, but your actual rate may be very different. Check your bill. Time-of-use tariffs charge more during peak hours, so calculate peak and off-peak usage separately
- Ignoring seasonal variation: Air conditioners and heaters run far more in summer or winter. Monthly estimates based on average usage will understate peak-season costs
Limitations of This Calculator
This calculator uses the rated wattage of each appliance, which may differ from actual running wattage. Variable-load appliances like refrigerators, air conditioners, and computers draw different amounts of power depending on their operating mode. For precise measurements, use a plug-in energy monitor or smart plug. The calculator does not account for tiered pricing structures where the rate changes based on total monthly usage, or for time-of-use plans where rates vary by time of day. It also does not include fixed customer charges, taxes, or utility surcharges that appear on your bill. Use your actual utility bill rate for the most accurate results.
Authoritative Research and Resources
- EIA Electric Power Monthly - Average Price of Electricity to Ultimate Customers - The official US Energy Information Administration table showing residential, commercial, and industrial electricity rates by month from 2016 through April 2026. The current US average residential rate is 18.83 cents per kWh.
- EIA Electricity Monthly Update - A monthly report from the EIA showing retail sales, average revenues per kWh, and year-over-year changes by sector. Reports that residential rates increased 7.3% from April 2025 to April 2026.
- ENERGY STAR Product Finder - The EPA's official database of energy-efficient appliances. Compare wattage and annual energy consumption of ENERGY STAR certified products to estimate savings from upgrading your appliances.