Enter Your Home & Appliance Details
Energy Audit Summary
Estimated Monthly Consumption (kWh): -
Estimated Yearly Consumption (kWh): -
Total Cost (Monthly): -
Total Cost (Yearly): -
Efficiency Score & Recommendations: -
🔍 Overview: Estimate Energy Use and Efficiency
The Home Energy Audit Calculator lets you estimate how much electricity your home appliances consume, how much it costs you monthly and annually, and identifies possible areas for improvement.
It works by calculating the total power usage across all listed appliances, then factoring in your energy price per kWh and home size. You’ll receive:
- 📉 Estimated monthly & yearly electricity use (in kWh)
- 💰 Total cost of electricity
- 📏 Consumption per square meter
- 🛠️ Suggestions for energy-saving upgrades
📐 Formula & Methodology
Appliance energy use is calculated per day, then multiplied to get monthly use:
Total Monthly kWh = Σ [ (Power in W ÷ 1000) × Usage Hours per day × 30 ]
Total monthly cost is calculated as:
Energy Cost (€) = Total Monthly kWh × Local Energy Rate (€/kWh)
Efficiency scoring considers:
- ⚡ kWh per m² of home area
- 🧱 Insulation rating
- 🪟 Window quality rating
If your home has high energy use per m² and poor insulation, the tool will recommend upgrades to improve efficiency.
📊 Example Scenario
For a 100 m² home with these appliances:
- Refrigerator: 150 W, 24 hours/day
- Air Conditioner: 2000 W, 4 hours/day
- LED TV: 100 W, 5 hours/day
If the energy rate is €0.20/kWh, the tool calculates:
- ⚡ Monthly energy use ≈ 226.5 kWh
- 💶 Estimated monthly cost ≈ €45.30
- 🔎 Consumption per m² = 2.26 kWh/m²
You might receive suggestions like: "Consider upgrading insulation or replacing high-consumption appliances."
💡 Common Use Cases
- 🏡 Homeowners analyzing high energy bills
- 🔌 Comparing appliance energy efficiency before purchase
- 📈 Tracking electricity cost over time
- 🌱 Planning a home renovation or insulation upgrade
- 🧾 Estimating monthly utility bills for budgeting
❓ Frequently Asked Questions
How is energy usage calculated for each appliance?
The tool multiplies each appliance’s power (in kW) by daily hours of use and then by 30 to estimate monthly kWh.
Can I use this to reduce my electricity bill?
Yes. It highlights high-usage appliances and suggests improvements based on efficiency score, helping you save energy and money.
What energy rate should I enter?
Enter your electricity provider’s rate in €/kWh, which is usually listed on your monthly energy bill.
What is a good energy efficiency per m²?
Around 1.5–2.5 kWh/m²/month is considered efficient. Above that may suggest poor insulation or high usage.
Does the tool consider seasonal variation?
No, it assumes consistent daily usage. You may adjust input hours to reflect summer vs winter patterns for air conditioners or heaters.
Can I include solar panel savings?
Not directly in this tool. But you can subtract estimated solar production from your total usage for a net consumption estimate.
Is this tool suitable for renters?
Absolutely. Renters can use it to understand their monthly energy profile and look for low-consumption appliances or negotiate with landlords.