Power Consumption Calculator
A free power consumption calculator that estimates daily, monthly, and yearly electricity usage and costs for your devices. Add appliances from 11 presets (Gaming PC, Laptop, AC, Refrigerator, IoT devices) or custom devices, set your electricity rate, and instantly see energy costs with CO2 emission tracking.
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What is a Power Consumption Calculator?
A Power Consumption Calculator estimates how much electricity your devices use and what it costs. By entering each device's wattage, daily usage hours, and weekly usage days, you can calculate energy consumption in kilowatt-hours (kWh) and estimate electricity bills. This is essential for managing energy costs, optimizing power usage, and reducing your carbon footprint.
How to Use the Power Consumption Calculator
- Click a device preset (e.g., Gaming PC, Laptop) to quickly add devices
- Adjust the wattage, hours per day, and days per week for each device
- Set your local electricity rate (cost per kWh)
- View daily, monthly, and yearly consumption and cost estimates
- Check the device breakdown to identify which appliances use the most energy
Frequently Asked Questions
How is power consumption calculated?
Power consumption in kWh = (Watts Γ Hours per day Γ Days per week / 7) / 1000. For example, a 500W gaming PC used 4 hours/day, 7 days/week = (500 Γ 4 Γ 1) / 1000 = 2 kWh per day or about 60 kWh per month.
What is a kWh?
A kilowatt-hour (kWh) is a unit of energy. 1 kWh = using 1,000 watts for 1 hour. It's the standard unit used by electricity companies to measure and bill energy consumption.
How much CO2 does electricity produce?
The average CO2 emission factor varies by country: about 0.4 kg CO2/kWh globally, 0.42 kg in the US, 0.46 kg in South Korea, and 0.23 kg in the EU. You can customize this value in the calculator.
Why does my actual electricity bill differ?
Real bills include tiered pricing, demand charges, taxes, fixed fees, and seasonal variations. This calculator gives an estimate based on constant rate and usage. Actual consumption also varies based on device efficiency, standby power, and usage patterns.