Home Energy Audit Calculator
Audit your home energy use by category — heating, hot water, appliances, lighting, and EV. See where your money goes and where to save.
Enter Your Values
Using shared profile · 3,500/mo · EUR — edit on Dashboard
Results update automatically as you change values.
Cost Breakdown
Energy Cost by Category
Click chart to expand
Energy Use by Category (kWh)
Click chart to expand
Scenario Analysis
How the outcome shifts if your assumptions turn out better or worse than expected.
LED, insulation, smart thermostat
Your breakdown
+25% heating, +10% prices
Compare Scenarios
Pin up to 3 and see them side by sideSet your inputs, then Pin current to save this scenario. Pin a few variations to compare their scores and outcomes here.
Confidence & Assumptions
The outcome shifts meaningfully with your assumptions. Sensible, but revisit the key inputs.
Annual Cost: €2,065 (worst) → €1,721 (expected) → €1,463 (best)
These estimates are for informational purposes only and do not constitute financial advice. Actual results may vary based on factors not captured in this calculator.
How This Calculator Works
What this calculator does
This calculator breaks your home energy use into categories and shows the cost of each, helping you identify the biggest savings opportunities.
How the calculation works
Enter annual kWh for each category and whether it uses gas or electricity. We calculate the cost per category and highlight your largest energy spend.
Formula
Category Cost = kWh × Fuel Price Electricity Total = Σ Elec kWh × Elec Price + Standing Charge × 365 Gas Total = Σ Gas kWh × Gas Price
Sources & defaults
- Typical retail tariff structures (standing + unit)
Standing charge × days + kWh × unit rate; inflate over the horizon
Example
Family home: Heating 12,000 kWh gas (€960), hot water 2,500 kWh gas (€200), appliances 800 kWh elec (€240). Total ~€2,000/yr. Heating is 48% of the bill.
How to Use This Calculator
- 1Enter your numbers
Fill in the inputs for Home Energy Audit Calculator. Defaults are realistic starting points — replace them with your actual figures.
- 2Understand the calculation
Enter annual kWh for each category and whether it uses gas or electricity. We calculate the cost per category and highlight your largest energy spend.
- 3Review results and scenarios
Check metrics, cost breakdown, comparison tables, and best / expected / worst scenarios. Use sliders to stress-test assumptions.
- 4Decide with the verdict
Read the decision engine recommendation and FAQ. Example: Family home: Heating 12,000 kWh gas (€960), hot water 2,500 kWh gas (€200), appliances 800 kWh elec (€240). Total ~€2,000/yr. Heating is 48% of the bill.
Factors to Consider
- Heating is usually the largest cost — insulation helps most
- Switching to LED lighting cuts lighting costs 75%
- EV charging can double electricity use
- Standby power from electronics adds 5-10%
- Smart thermostats save 10-15% on heating
Common Mistakes
- Confusing energy demand (kWh heat) with fuel consumption
- Forgetting standing charges in electricity totals
- Not separating gas and electricity categories correctly
- Underestimating standby power from always-on devices
Frequently Asked Questions
How do I find my category breakdown?+
Check smart meter data, energy monitor apps, or estimate: heating ~60-70% of total energy, hot water ~15%, appliances ~10%, lighting ~5%.
Where should I invest first?+
Target your biggest category. For most homes, insulation and heating upgrades deliver the best return. Then LED lighting and efficient appliances.
What is a typical home energy use?+
EU average: ~3,500 kWh electricity + ~12,000 kWh gas per year for a family home. All-electric homes with heat pumps use ~8,000-12,000 kWh electricity.
This calculator provides estimates for informational purposes only and does not constitute financial, investment, tax, or legal advice. Always consult a qualified professional before making important financial decisions.
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