Calculate the electricity cost of any appliance based on wattage and usage.
Understanding the electricity cost of individual appliances and devices helps identify the largest contributors to a monthly utility bill, making it possible to reduce consumption strategically rather than simply hoping usage drops. The CalcEqual Electricity Cost Calculator converts any appliance's wattage, daily usage hours, and your local electricity rate into precise daily, monthly, and annual cost figures — illuminating, for instance, that an old refrigerator running 24 hours a day is costing $15+ per month, while a phone charger left plugged in costs mere cents.
Homeowners and renters use this tool to evaluate whether energy-efficient appliance upgrades justify their purchase premium, to compare the ongoing cost of different devices before buying, and to identify high-consumption items that might warrant behavioral changes (like turning off devices rather than leaving them on standby). Energy auditors and sustainability consultants use the same fundamental calculation at a broader scale when assessing a building's energy profile.
The electricity rate input is critical because rates vary enormously by utility provider, region, and even time of day for customers on time-of-use pricing plans — checking your actual recent electricity bill for your per-kWh rate (often stated on the bill alongside total kWh consumed) will produce a far more accurate cost estimate than using a national average figure.
This calculation also underlines the practical meaning of the kilowatt-hour (kWh) unit that appears on every electricity bill — a 1,000-watt (1 kW) appliance running for exactly one hour consumes exactly 1 kWh, making the kWh a concrete, intuitive unit once the underlying watt-hour arithmetic becomes familiar through calculations like this one.
Net metering arrangements, available to homeowners with solar panels in most U.S. states, change the effective electricity cost equation significantly by crediting excess solar generation against grid electricity consumption, sometimes reducing net monthly electricity costs to near zero or even producing a bill credit — a scenario this base calculator doesn't capture but which represents a growing proportion of residential electricity situations.
The kilowatt-hour as a billing unit became standard alongside the commercialization of electrical power distribution in the late 19th century, with Thomas Edison's Pearl Street Station in New York City (1882) among the first commercial electricity systems to charge customers by measured consumption. Early electricity meters recorded consumption in kilowatt-hours, establishing the unit that remains universally standard for residential and commercial electricity billing worldwide today.
The U.S. Energy Information Administration publishes monthly state-level average retail electricity prices, which are the appropriate benchmark for this calculator's rate input — rates in 2025 range from around $0.10/kWh in low-cost states to over $0.30/kWh in Hawaii, meaning a household's annual electricity cost for the same usage pattern can differ by a factor of three or more depending purely on geographic location.
Typical wattage for common household appliances:
| Appliance | Typical Wattage |
|---|---|
| LED Bulb | 8–15 W |
| Laptop | 45–65 W |
| TV (55-inch) | 80–150 W |
| Refrigerator (modern) | 100–200 W |
| Electric Oven | 2,000–5,000 W |
| Central AC | 3,500–5,000 W |
Time-of-use electricity pricing plans, offered by some utilities, charge higher rates during peak demand hours (typically afternoon and evening) and lower rates during off-peak periods — for households on such plans, shifting high-consumption tasks like laundry and dishwashing to off-peak hours can meaningfully reduce the effective per-kWh rate used in this calculation.