Electricity Cost Calculator
Wondering how much your electricity bill is driven by a single appliance? This electricity cost calculator estimates the energy cost of any device from its wattage, hours of use, and your rate per kWh. Use it to budget your electric bill, compare appliance efficiency, or decide whether upgrading to an energy-efficient model is worth it.
Reviewed by the SparkCalc editorial team
How We Calculate This
Daily kWh = (Watts × Hours) / 1000. Monthly kWh = Daily × 30. Cost = kWh × Rate. Appliance comparisons assume average daily usage patterns.
Sources: U.S. Department of Energy, Energy Saver — Estimating Appliance and Home Electronic Energy Use · U.S. Energy Information Administration — How Much Electricity Does an American Home Use? · U.S. Energy Information Administration — Electric Sales, Revenue, and Average Price
Frequently Asked Questions
How do I find the wattage of my appliance?
Look for a label on the appliance showing watts (W) or amps (A). If only amps are shown, multiply by voltage (typically 120V in US) to get watts. Check the manual or manufacturer website.
What is a kWh?
A kilowatt-hour (kWh) is a unit of energy equal to 1,000 watts used for one hour. Your electricity bill charges based on kWh consumed. A 100W bulb running for 10 hours uses 1 kWh.
What is the average electricity rate?
The US average is about $0.12-0.15 per kWh, but rates vary widely by location. Check your electricity bill for your actual rate. Some areas have tiered rates or time-of-use pricing.
Which appliances use the most electricity?
Heating/cooling systems, water heaters, electric dryers, and refrigerators typically use the most energy. Pool pumps, space heaters, and electric ovens are also high consumers.
How do I calculate my electricity cost?
Multiply an appliance's wattage by the hours you run it, divide by 1,000 to get kWh, then multiply by your electricity rate. For example, a 1,500W heater run 4 hours a day at $0.15/kWh costs about $0.90 per day, or roughly $27 per month on your energy bill.
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