Energy & Appliances

Appliance kWh Calculator

Estimate appliance electricity use in kWh from wattage and runtime.

FreeResult emailed + shownReviewed September 9, 2026
Energy & Appliances
Step 1

Enter your numbers

Method

How this appliance kwh calculator works

Watts are converted to kilowatts and multiplied by operating hours and days.

How to use it

  1. Power draw. Enter the value in W.
  2. Hours used per day. Enter the value in hours.
  3. Days used. Enter the value in days.
  4. Request the result. Add your email, then select “Email & show my result.”

What to do with the number

Nameplate wattage may differ from average draw when an appliance cycles or changes power. Use a plug-in energy meter for appliances with variable or cycling loads.

Planning estimate

Use this result as a starting point, not a guarantee. Product specifications, site conditions, manufacturer guidance, local codes, taxes, labor, tolerances, and rounding can change the real requirement or cost.

FAQ

Questions about this calculator

What does the Appliance kWh Calculator calculate?

Estimate appliance electricity use in kWh from wattage and runtime.

What inputs does this appliance kwh calculator use?

The calculator uses power draw, hours used per day, days used. You can replace every default with the numbers that match your situation.

How should I use the Appliance kWh Calculator result?

Nameplate wattage may differ from average draw when an appliance cycles or changes power.

What can make the real-world result different?

Use a plug-in energy meter for appliances with variable or cycling loads.

Can I change the calculator assumptions?

Yes. The editable inputs are the assumptions. Replace the default values with your own measurements, prices, rates, quantities, or specifications before requesting the result.