Appliance Energy Calculator
Enter an appliance's wattage, daily usage, and your electricity price to find its energy cost.
How appliance running cost is calculated
Daily energy use is found by multiplying an appliance's wattage by its hours of use, then dividing by 1,000 to convert watt-hours into kilowatt-hours (kWh) — the unit electricity is typically billed in. Multiplying by your electricity price gives the daily cost, which is then scaled to monthly and yearly estimates.
This gives a straightforward estimate assuming consistent daily usage and a constant electricity price. Many appliances (like refrigerators or HVAC systems) don't run continuously at full power, so their actual energy use may differ from a simple wattage × hours calculation.
Frequently asked questions
Where do I find an appliance's wattage?
Check the appliance's label, nameplate, or user manual — it's often listed directly in watts, or you may need to calculate it from listed volts and amps (watts = volts × amps) if only those are given.
Why might my actual electricity bill differ from this estimate?
Many appliances cycle on and off automatically (refrigerators, air conditioners) rather than running continuously at full wattage, so their average power draw is lower than their rated wattage. This calculator assumes constant full-power use for the hours entered.
Where do I find my electricity price per kWh?
Check a recent electricity bill, which typically lists the rate per kWh, or contact your utility provider. Rates can also vary by time of day or season in some pricing plans.