Appliance Energy Cost Calculator
Calculate the true annual electricity cost of any appliance using its wattage, daily usage hours, days per week, your electricity rate, and the number of units. Essential for budgeting solar or identifying energy hogs.
Last updated: June 2026
Annual running cost
262.08 $/yr
$100-300/yr marks a major load like a space heater or old fridge. The $262 example heater costs about $22/month; cutting use 2 h/day would save around $90/yr.
Annual cost scales directly with watts, runtime, and rate; the US average residential rate is about $0.16/kWh, the basis of the verified $262/yr example for a 1500 W heater run 3 h/day.
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About this calculator
Electricity is billed in kilowatt-hours (kWh), where 1 kWh = 1,000 watts running for one hour. To find annual consumption, the appliance's power draw is converted from watts to kilowatts (÷ 1000), then multiplied by daily hours of use, annual weeks of operation (daysPerWeek × 52), and the quantity of identical units. The annual cost formula is: cost = (powerWatts / 1000) × hoursPerDay × (daysPerWeek × 52) × electricityPrice × quantity. This gives the exact figure you'd see on your electricity bill attributable to that appliance. It's especially useful when sizing a solar system — knowing which appliances consume the most kWh lets you prioritise offset targets or consider replacing inefficient devices.
How to use
You have 2 chest freezers, each drawing 100 W, running 24 hours/day, 7 days/week. Your electricity rate is $0.13/kWh. Annual cost = (100 / 1000) × 24 × (7 × 52) × 0.13 × 2. Step by step: 0.10 kW × 24 h = 2.4 kWh/day per unit. 2.4 × 364 days/year = 873.6 kWh/yr per unit. 873.6 × 2 units = 1,747 kWh/yr total. 1,747 × $0.13 = $227/yr. Replacing one freezer with a more efficient 45 W model would save roughly $100 annually at the same rate.
Frequently asked questions
How do I find the wattage of an appliance if it isn't printed on the label?
Most appliances list wattage, voltage, and amperage on a label near the power cord or on the nameplate plate, often on the back or underside. If only voltage (V) and amperage (A) are listed, wattage = V × A. For variable-draw devices like refrigerators or air conditioners, the label shows peak or rated watts, but average consumption is lower — a plug-in energy monitor like a Kill-A-Watt meter gives the actual kWh over time. Many utility websites also publish average consumption figures for common appliances.
What appliances use the most electricity in a typical home?
Heating and cooling systems (HVAC) are usually the single largest consumer, accounting for 40–50% of the average US home's electricity bill. Water heaters, clothes dryers, and electric ovens are the next biggest loads. Refrigerators and freezers run continuously and contribute meaningfully despite their modest wattage. Surprisingly, always-on phantom loads — TVs on standby, game consoles, cable boxes, and phone chargers — can collectively add 5–10% to a home's annual consumption. Calculating each appliance's cost helps identify the biggest wins for efficiency upgrades or solar offset planning.
How can I use appliance energy costs to size my solar panel system?
Add up the annual kWh consumption of all the appliances you want solar to cover — this becomes your total load to offset. Divide by 12 to get the monthly kWh target and enter it into a solar sizing calculator as your usage figure. This bottom-up approach is more precise than using your utility bill alone, especially if you plan to add new loads like an EV charger or heat pump. It also highlights which appliances to replace or schedule during peak solar production hours to get the most value from your panels.