Enter Appliance Data
Results
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Total Consumption (kWh): -
Total Cost: -
⚡ Overview: Calculate Appliance Energy Use & Cost
The Electricity Consumption Calculator helps homeowners, renters, and energy-conscious users understand the power usage and cost of running everyday appliances. Whether you're managing your energy budget or planning for solar power needs, this tool gives you fast, accurate, and insightful results.
- 📊 Calculate energy consumption in kilowatt-hours (kWh)
- 💸 Estimate electricity cost based on your local utility rate
- 🔢 Compare multiple appliances side by side
- 🌍 Supports both metric and imperial units
Just enter the appliance wattage, average daily usage, number of days, and your electricity price per kWh. The calculator will output the total kWh and cost over the selected period.
🧮 Formula & Methodology
The core formula for calculating electricity usage and cost is:
Energy (kWh) = (Wattage × Hours per Day × Number of Days) ÷ 1000
Cost = Energy (kWh) × Electricity Rate (cost per kWh)
If you're calculating multiple appliances, the calculator totals all kWh values and computes the combined electricity cost.
This is especially helpful for identifying energy-intensive devices or estimating monthly household energy bills.
📊 Example Calculation
Scenario: You're using a 1500-watt space heater for 3 hours per day over a 30-day month, and your utility rate is €0.20 per kWh.
- Step 1: Daily energy use = 1500 × 3 = 4500 Wh = 4.5 kWh
- Step 2: Monthly use = 4.5 × 30 = 135 kWh
- Step 3: Monthly cost = 135 × 0.20 = €27
🔌 Appliance Consumption Examples
Use the chart below to estimate daily consumption and compare common appliances:
| Appliance | Wattage (W) | Avg. 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 | 0.6 |
| Air Conditioner | 1500 | 6 | 9.0 |
| Washing Machine | 500 | 1 (per load) | 0.5 |
| Dishwasher | 1200 | 1.5 | 1.8 |
These examples provide a rough guide. Your actual usage may vary based on brand, model, and usage habits.
📋 Practical Use Cases
- 🔌 Track household appliance energy use and spot energy hogs
- 💡 Optimize usage to reduce electricity bills
- 🏠 Plan energy needs for solar panel or backup battery systems
- 📚 Teach students or employees about energy efficiency
- 🧮 Calculate appliance operating costs for budgeting
The tool is ideal for personal finance planning, home energy audits, and sustainability projects.
❓ Frequently Asked Questions
How do I find my appliance’s wattage?
Check the label or user manual. Wattage is usually listed in watts (W). You can also search the model online or use a watt-meter for precise measurements.
Is this calculator accurate for standby power?
You can estimate standby power by entering the device’s idle wattage and average standby hours. Some electronics use 1–10W even when off.
Can I calculate energy use per month or year?
Yes! Simply adjust the "Days" input field—use 30 for a month or 365 for a year—to see long-term electricity usage and cost.
Can I enter multiple appliances?
Absolutely. Use the "Add Appliance" feature to list multiple devices. The tool will display totals for both kWh and cost.
What is a good electricity rate to use?
Check your latest utility bill or regional average. In the EU, rates often range from €0.18–€0.30/kWh. In the US, the average is about $0.13/kWh.
Can this tool help reduce my energy bill?
Yes! By identifying your highest-energy appliances, you can reduce usage, swap for efficient models, or run them during off-peak hours.
Does the tool support solar cost comparison?
While not specifically built for solar input, you can compare consumption against your solar output to estimate net usage and savings.