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Home energy cost calculators

What does it really cost to run?

Space heaters, air conditioners, heat pumps, EV chargers and solar panels, priced at your state's electricity rate instead of a national average. Every result shows the data month and the math.

Start with electricity cost →Rates by state

What do you want to price?

Rates

Rates by stateAverage electricity rate and bill in all 50 states and DC

Running costs

Electricity costCost to run any appliance, by hour, day, month and yearElectric billYour monthly bill by appliance vs your state average

Heating & cooling

Space heaterHeating one room vs the whole houseAC costAir conditioner cost per hour and per summer month

Solar & EV

EV chargingCost per charge, per month and per mile vs gasoline

Tools

Watts to ampsConvert watts, amps, volts, kWh and dollars

Why WattSums

01

Your state’s rate

Electricity costs more than three times as much in some states as in others. Every result starts from your state’s EIA average, with the data month shown.

02

Or the rate on your bill

Type the rate from your own bill and every result updates. It stays on your device.

03

The math, shown

Formula, assumptions and a worked example on every page, so you can check us by hand.