Updated April 2026 · EIA data
Energy Tools
Free calculators and comparison tools powered by real EIA electricity rate data, covering all 51 U.S. states. The national average residential rate is 17.92¢/kWh; rates range from 11.81¢ in North Dakota to 40.59¢ in Hawaii.
Available Tools
Electricity Cost Calculator
Calculate the cost to run any appliance based on wattage, hours of use, and your state's electricity rate.
Use tool →Monthly Bill Estimator
Estimate your monthly electricity bill based on your state's rates and typical household usage.
Use tool →How These Tools Work
Every calculator uses the same conversion: an appliance’s wattage divided by 1,000 gives kilowatts, multiplied by hours of use gives kilowatt-hours (kWh), multiplied by your state’s per-kWh rate gives a dollar cost. The arithmetic is straightforward; what makes the tools useful is the up-to-date state rate data behind them. Because residential rates differ by 3x or more across the country, the same appliance running for the same hours can cost dramatically different amounts depending on where you live.
The bill estimator extends the same logic to whole-home consumption. EIA publishes per-state average household electricity use, typically reported as monthly or annual kWh figures by climate region. Multiplying that average by your state’s residential rate produces a baseline monthly bill. Real bills vary because home size, heating fuel, appliance mix, and personal habits change consumption by a wide margin — but the EIA average is a useful sanity check against what a utility bill should roughly look like.
Cutting Your Bill: What the Data Shows
Three appliance categories drive most household electricity bills: heating and cooling, water heating, and refrigeration. The U.S. Department of Energy’s Energy Saver resources lay out the high-leverage swaps — heat pump conversion, smart thermostats, LED lighting — and the ENERGY STAR certification program publishes appliance-level efficiency comparisons. For solar, battery, and EV-charging cost analysis, the National Renewable Energy Laboratory publishes the most detailed federal analysis available.
Time-of-use rates are increasingly common, especially in deregulated markets and California. If your utility offers a time-of-use tariff, shifting heavy loads (laundry, dishwashing, EV charging) to off-peak windows can cut the effective per-kWh cost meaningfully. The state-level numbers shown here are averages across all rate plans; for time-of-use math, check your utility’s tariff sheet directly.
Methodology & Data Source
Data Source
All calculations use real electricity rate data from the U.S. Energy Information Administration (EIA). Rates are updated regularly as new EIA monthly data becomes available, and emissions or clean-energy program context comes from the U.S. Environmental Protection Agency and the National Renewable Energy Laboratory.
Read the full methodology for how rate data is processed and how the calculators handle missing or partial state values.
Frequently Asked Questions
What does the electricity cost calculator do?
The calculator multiplies an appliance's wattage by the hours it runs to produce kilowatt-hours, then multiplies that by your state's residential electricity rate to give a per-day, per-month, and per-year cost. Wattage is usually listed on the appliance label or in the manual; for typical household devices the EIA publishes reference watt figures.
How accurate is the monthly bill estimator?
The estimator uses the EIA-published average household consumption for your state — usually somewhere between 700 and 1,200 kWh per month — multiplied by your state's residential rate. Actual bills will vary based on home size, climate, heating fuel, and appliance efficiency, so treat the estimate as a starting point rather than a precise prediction.
Where do the rate values come from?
Every per-state rate value is pulled directly from the U.S. Energy Information Administration's Form EIA-861 monthly survey data. The dataset was last refreshed April 2026. Across the country today, residential rates range from roughly 11.81¢/kWh in North Dakota to 40.59¢/kWh in Hawaii.
Why are the rates here different from what's on my utility bill?
EIA reports state-average all-in rates, which include generation, transmission, distribution, and applicable surcharges. Your actual bill may show those components separately and may include taxes, fixed customer charges, and time-of-use adjustments not captured in the state-average figure. For an exact figure, check your utility's tariff sheet or your most recent bill.
Are these tools financial advice?
No. They are educational calculators meant to help households and small businesses understand their electricity costs and compare scenarios. For purchasing decisions on solar, batteries, or major appliances, the U.S. Department of Energy's ENERGY STAR program and the National Renewable Energy Laboratory publish more detailed analyses, and a qualified contractor or utility energy advisor can provide site-specific guidance.
Sources: U.S. Energy Information Administration, U.S. Environmental Protection Agency, National Renewable Energy Laboratory. All federal datasets are public domain.
Last updated 2026-04-12 · 51 states tracked.