Appliance Energy Cost Calculator

The calculator converts your appliance's power rating to kilowatts, then multiplies it by daily usage hours to get kWh per day. Multiplying daily kWh by your electricity price gives the daily cost, which is then scaled to monthly (×30.417) and annual (×365) figures. The formula is: Cost = Power (kW) × Usage (hours) × Electricity Rate ($/kWh).

In the United States, the average residential electricity rate is approximately $0.13 per kWh, though it varies significantly by state — ranging from around $0.09/kWh in Louisiana to over $0.25/kWh in Hawaii and California. Check your utility bill for your exact rate.

Central air conditioners (2,000–5,000 W), electric water heaters (3,000–4,500 W), clothes dryers (4,000–5,000 W), and electric ovens (2,000–5,000 W) are typically the biggest energy consumers. Refrigerators and washing machines are moderate consumers, while LED bulbs and laptops use very little power.

The main factors are the appliance's wattage (power rating), how many hours per day you use it, and your local electricity rate. The age and efficiency of the appliance also matter — older appliances often consume significantly more energy than modern Energy Star-rated equivalents.

Check the label on the back or bottom of your appliance — it usually lists wattage (W) or amperage (A) and voltage (V). If listed in amps, multiply amps × volts to get watts. Your appliance manual or the manufacturer's website are also reliable sources.

The most effective strategies are replacing old high-wattage appliances with Energy Star-certified models, reducing daily usage time, unplugging devices when not in use to eliminate standby power draw, using appliances during off-peak hours if your utility offers time-of-use rates, and setting thermostats a few degrees warmer in summer and cooler in winter.

Standby power (also called phantom load or vampire power) is the electricity drawn by appliances when they are turned off but still plugged in. Common culprits include TVs, game consoles, and chargers. A single device may only use 1–5 W on standby, but across an entire household this can account for 5–10% of your total electricity bill annually.

Use this formula from the U.S. Department of Energy: Annual kWh = (Wattage × Hours Used Per Day × Days Used Per Year) ÷ 1,000. Then multiply the result by your electricity rate in $/kWh to get the annual cost. For example, a 1,500 W heater used 4 hours/day for 120 days = 720 kWh/year. At $0.13/kWh, that's $93.60/year.