Enter Appliance Data
Results
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Total Consumption (kWh): -
Total Cost: -
Overview
The Electricity Consumption Calculator helps you estimate the cost of running one or more appliances over a specified period. By entering the appliance's wattage, daily usage, number of days, and your local electricity rate, you receive a detailed breakdown of energy consumption (in kWh) and the associated cost.
Explanation & Methodology
The calculation converts watt-hours to kilowatt-hours by dividing by 1000, then multiplies the total kWh by your local electricity rate to determine the cost.
Formula:
Cost = (Wattage × Hours per Day × Days) / 1000 × Cost per kWh
When multiple appliances are compared, the tool sums the kWh and cost for each appliance to provide overall totals.
Example Calculation
For a 1500W appliance used for 3 hours a day over 30 days at a rate of €0.20 per kWh:
Consumption = (1500 × 3 × 30) / 1000 = 135 kWh
Cost = 135 × 0.20 = €27
Appliance Consumption Examples
| Appliance | Wattage (W) | Typical Usage (hrs/day) | Est. kWh/Day |
|---|---|---|---|
| Refrigerator | 150 | 8 (duty cycle) | 1.2 |
| LED TV | 100 | 5 | 0.5 |
| Desktop Computer | 300 | 6 | 1.8 |
| Laptop | 65 | 4 | 0.26 |
| Microwave | 1200 | 0.5 | 0.60 |
| Air Conditioner | 1500 | 6 | 9.0 |
| Washing Machine | 500 | 1 (per load) | 0.50 |
| Dishwasher | 1200 | 1.5 | 1.80 |
Use these examples as a reference to compare against your own appliances.
Frequently Asked Questions
How is energy consumption calculated?
The tool calculates energy usage by multiplying an appliance's wattage by its usage hours per day and the number of days, then dividing by 1000 to convert watt-hours to kilowatt-hours.
Can I compare multiple appliances?
Yes. You can add multiple appliance entries using the "Add Appliance" button. The tool then sums the consumption and cost for all entries.
How can I reduce my electricity costs?
By comparing the energy consumption of various appliances, you can identify high-energy devices and consider alternatives or energy-saving practices.