Enter your device's power consumption (in watts or kilowatts), usage time, and your electricity rate to find out exactly what it costs to run any appliance for a single session. The Electricity Cost – Single Usage Calculator returns the energy consumed (kWh) and the total cost so you know what each device is actually adding to your bill.
Total Electricity Cost
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Energy Consumed
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Device Power
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Usage Duration
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The calculation has two steps. First, multiply the device's power (in kW) by the usage time (in hours) to get energy consumed in kWh. Then multiply that kWh figure by your electricity rate ($/kWh) to get the total cost. For example, a 1,500W heater running for 2 hours consumes 3 kWh; at $0.13/kWh that costs $0.39.
A 1,500W appliance (like a space heater or hair dryer) uses 1.5 kWh per hour. At the US average rate of about $0.13/kWh, that's roughly $0.20 per hour. Running it for a full day (24 hours) would cost about $4.68.
Heating and cooling systems (HVAC) typically account for up to 50% of a home's electricity use. Other major consumers include water heaters, electric ovens, clothes dryers, and refrigerators. High-wattage devices that run for long periods have the biggest impact on your bill.
A watt (W) is a unit of power — the rate at which energy is used. A kilowatt-hour (kWh) is a unit of energy — the total amount used over time. A 1,000W (1 kW) device running for 1 hour consumes 1 kWh. Your electricity bill charges you per kWh of energy consumed, not per watt of power.
Your electricity rate (price per kWh) is listed on your monthly utility bill, usually in the rate or charges breakdown section. Rates vary by location, season, and provider. The US national average is around $0.12–$0.16 per kWh, but some states or countries can be significantly higher or lower.
Yes, 100 kWh per day is very high for a typical household. The average US home uses about 30 kWh per day (roughly 900 kWh per month). Consumption at 100 kWh/day would suggest very high usage, possibly including electric vehicle charging, a large home, or energy-intensive equipment.
The most effective ways to reduce your bill are to switch to energy-efficient appliances (look for ENERGY STAR labels), use smart power strips to eliminate standby power, adjust your thermostat by a few degrees, switch to LED lighting, and run high-wattage appliances like washers and dryers during off-peak hours when rates may be lower.
This calculator handles the conversion automatically. If your device is rated in BTU/hour, 1 BTU/h ≈ 0.29307 W. If it's rated in horsepower, 1 metric hp ≈ 735.5 W. Just select the correct unit from the dropdown and enter the value from your appliance's label.