Home energy calculators and tools
All of them use your state's electricity price from the U.S. Energy Information Administration (August 2026), or a price you enter. They run in your browser; nothing you type is sent to us.
Understand my bill
Why it went up, and how your price compares with your state.
- Bill checkerTwo bills in, the change split into usage, price per kWh, fixed charges, taxes and billing days.
- Bill diagnosisFour short questions; possible causes sorted by evidence, with how to check each.
Calculate energy cost
What one appliance or your heating costs at your state’s price.
- Appliance costWatts, hours, running share and season, or the EnergyGuide kWh figure.
- Space heater costPer hour, day and month for a 750 W or 1,500 W heater.
- Heating cost: heat pump vs gasHeat pump, gas, propane, oil or electric heat, with cold-weather what-ifs.
Compare & save
Try changes side by side before you spend money.
- Home energy savings plannerUp to four scenarios: fewer hours, another appliance, another price or a heat pump.
- Space heater vs central heatHeat one room and turn the house down: does it save with your fuel and state prices?
Data behind them
Electricity rates in all 50 states and DC · Data & methodology