Appliance Energy Calculator -- Electricity Cost Estimator

Appliance Energy Cost Calculator

Enter an appliance's wattage and daily usage to see how much it costs to run. Add up to 5 appliances to compare them side by side.

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How It Works

The energy cost of an appliance is calculated using this formula:

Energy (kWh) = Wattage (W) x Hours per Day / 1,000

Daily Cost = Energy (kWh) x Electricity Rate ($/kWh)

Wattage measures the power an appliance consumes while running. You can usually find it on the appliance label, in the owner's manual, or on the manufacturer's website. When you divide wattage by 1,000 and multiply by hours of use, you get kilowatt-hours (kWh) -- the unit your utility company uses for billing.

Monthly estimates use 30.44 days (365/12), and yearly estimates use 365 days. If you set "days used per week" to less than 7, all periods are scaled proportionally.

Example Calculation

Common Appliance Wattage Reference

Use this table to look up typical wattages for common household appliances. Actual wattage may vary by model and efficiency rating.

Values are approximate and vary by brand, model, and efficiency. Check your appliance label or documentation for exact wattage.

Tips for Reducing Energy Consumption

• Switch to LED lighting. LEDs use about 75% less energy than incandescent bulbs and last 25 times longer. Replacing just 5 frequently used bulbs can save $50+/year.
• Unplug phantom loads. Many devices draw 1-5W even when "off." Use a smart power strip to cut power to TVs, chargers, and game consoles when not in use. Phantom loads can account for 5-10% of your electric bill.
• Upgrade to Energy Star appliances. Energy Star certified refrigerators, dishwashers, and washing machines use 10-50% less energy than standard models.
• Use a programmable thermostat. Adjusting temperature by 7-10 degrees for 8 hours/day (while sleeping or at work) can save up to 10% on heating and cooling.
• Run full loads. Dishwashers and washing machines use roughly the same energy whether half-full or full. Wait for a full load to maximize efficiency.
• Air dry when possible. Clothes dryers are among the most energy-hungry appliances. Line-drying or using a drying rack can save $100+/year.
• Keep HVAC filters clean. A dirty filter forces your HVAC system to work harder. Replace or clean filters every 1-3 months to maintain efficiency.
• Lower water heater temperature. Setting your water heater to 120 degrees F (instead of the default 140 degrees F) reduces standby heat losses by 4-22%.
• Use off-peak electricity rates. If your utility offers time-of-use pricing, run high-energy appliances (dryer, dishwasher) during off-peak hours for lower rates.

Frequently Asked Questions

How do I calculate the electricity cost of an appliance?

Multiply the appliance's wattage by the number of hours you use it per day, then divide by 1,000 to convert to kilowatt-hours (kWh). Multiply the kWh by your electricity rate to get the daily cost. For example, a 1,500W space heater used 4 hours per day at $0.16/kWh costs 6 kWh/day, which is $0.96/day or about $29.22/month.

What is a kilowatt-hour (kWh)?

A kilowatt-hour is a unit of energy equal to using 1,000 watts of power for one hour. It is the standard billing unit on residential electricity bills. A 100-watt light bulb running for 10 hours consumes exactly 1 kWh.

Where can I find my appliance's wattage?

Check the label on the back or bottom of the appliance, look in the owner's manual, or search the manufacturer's website. The wattage is often listed as "W" or "Watts." Some labels list amps and volts instead; multiply amps by volts to get watts (W = A x V).

What is the average electricity rate?

The average US residential rate is approximately $0.16 per kWh. However, rates vary significantly by location. States like Louisiana and Idaho can be as low as $0.10/kWh, while Hawaii and Connecticut may exceed $0.30/kWh. Check your latest utility bill for your exact rate.

Which appliances use the most electricity?

The biggest energy consumers are typically central air conditioning (3,500-5,000W), electric water heaters (4,000-5,500W), clothes dryers (2,000-5,000W), electric ovens (2,000-5,000W), and space heaters (1,000-1,500W). Refrigerators use moderate wattage but run continuously, making them significant over time.

What is a phantom load?

A phantom load (also called vampire power or standby power) is the electricity consumed by devices that are turned off but still plugged in. Examples include phone chargers, TVs in standby, cable boxes, and gaming consoles. These loads typically range from 1 to 5 watts each but can add up to 5-10% of your total electricity bill.

Does this calculator store my data?

No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.

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Privacy

This calculator runs entirely in your browser. No appliance data, energy usage, or cost information is transmitted or stored anywhere. Your privacy is fully protected.

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