Appliance Electricity Cost Calculator
Calculate the running cost of individual household appliances, accounting for cycling duty cycles, operating hours, and your local electricity rate.
Appliance Specifications & Cycle
Appliance Operating Cost Formula
Monthly Cost = [(Wattage × Duty Cycle % × Daily Hours ÷ 1,000) × Monthly Days] × Electricity Rate per kWh- Operating Duty Cycle: Accounts for cycling appliances like refrigerators and AC units that do not run at full rated power 100% of the time.
- Appliance Count: Multiplier for households operating identical fixtures (e.g., 6 halogen cans or 2 dehumidifiers).
- Electricity Rate ($/kWh): Local utility charge per kilowatt-hour from your electric bill.
Step-by-Step Worked Example
Calculation Steps:
How to Use This Calculator
Assumptions & Limitations
- Duty cycle models thermostatic compressor on/off cycling rather than continuous peak draw.
- Does not factor in time-of-use peak surcharges unless an average blended rate is entered.
Frequently Asked Questions
Why shouldn't I assume appliances draw 100% maximum wattage constantly?
Modern refrigerators, air conditioners, heat pumps, and dishwashers cycle compressors on and off. A 600W refrigerator typically only runs its compressor 30% to 50% of the hour, meaning effective average power is roughly 200W to 300W.
Which home appliances use the most electricity?
Central air conditioners, heat pumps, water heaters, clothes dryers, and electric range ovens consume the largest share of residential electricity in the United States.
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