Enter your device's Power Consumption and Power Unit, then set your Usage Hours, Usage Period, Days Used Per Month, and Electricity Rate to calculate your Daily, Monthly, and Annual Energy Consumption — plus the Daily and Monthly Cost of keeping that device running.
Daily Energy Consumption
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Monthly Energy Consumption
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Annual Energy Consumption
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Daily Cost
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Monthly Cost
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Annual Cost
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Power consumption is calculated using the formula: Energy (kWh) = Power (W) × Time (hours) ÷ 1000. This gives you the kilowatt-hours consumed, which is then multiplied by your electricity rate to determine cost.
Watts (W) measure power, while kilowatts (kW) are simply watts divided by 1000. For example, 1000 watts equals 1 kilowatt. Kilowatt-hours (kWh) measure energy consumption over time and appear on your electricity bill.
Check the nameplate or label on your appliance, which usually lists the power consumption in watts. You can also find this information in the user manual or manufacturer specifications online.
Actual costs may vary due to tiered pricing structures, time-of-use rates, taxes, fees, and seasonal variations in your electricity bill. The calculator provides estimates based on average usage patterns.
High-power appliances include air conditioners (3000-5000W), electric water heaters (4000-5500W), electric dryers (2000-5000W), and space heaters (1500W). These typically have the biggest impact on your electricity bill.
Use energy-efficient appliances, unplug devices when not in use, adjust thermostat settings, switch to LED bulbs, and consider using timers or smart plugs to control usage automatically.
Electricity rates vary by location but typically range from $0.08 to $0.30 per kWh in the US. Check your electricity bill or contact your utility company for your exact rate, as it may include additional fees and taxes.