Electricity cost calculators

What does it cost to run a heater, AC or EV charger? How many solar panels do you need? Instant answers using your own electricity price.

Electricity cost of any device

Power (watts)

Hours used per day

Days per month

Electricity price ($ per kWh)

Default rate 17¢/kWh ≈ recent US residential average (EIA). Use the price per kWh on your own bill, including delivery charges, for an accurate figure.

Electricity cost

Electricity Cost CalculatorRunning cost of any device kWh CalculatorWatts × hours to kWh Electricity Bill CalculatorMonthly bill from your appliances

Solar

Solar Panel CalculatorHow many solar panels you need Solar Payback CalculatorPayback period and lifetime savings

Electrical basics

Watts to Amps CalculatorAmps from watts and volts Amps to Watts CalculatorWatts from amps and volts Generator Size CalculatorWhat size generator you need Battery Runtime CalculatorHours of runtime for any load

Saving energy

LED Savings CalculatorSavings from switching to LED Air Conditioner BTU CalculatorBTU size for a room

Cost to run common appliances

Find your real electricity price

Divide the total of your bill (energy + delivery, before taxes you cannot avoid) by the kWh used. That "all-in" price per kWh is the one to use in every calculator here; the headline energy rate alone usually understates costs.

X Facebook Reddit WhatsApp LinkedIn

Embed this free calculator on your site (copy & paste):

<iframe src="https://kwhcalc.pages.dev/?embed=1" width="100%" height="640" style="border:1px solid #ddd;border-radius:12px" loading="lazy" title="KWhCalc calculator"></iframe><p style="font-size:13px">Calculator by <a href="https://kwhcalc.pages.dev/">KWhCalc</a></p>

Free calculator by KWhCalc