EPC Rating Calculator
Enter energy consumption and floor area to estimate the rating.
Estimated efficiency score
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Enter values above
Energy per m²
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Energy band
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Annual energy cost
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Net energy use
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Score if heating cut 20%
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Worked example
With the default inputs shown below, this calculator returns the following results:
| Input | Value |
|---|---|
| Annual heating energy (kWh) | 12000 |
| Annual electricity use (kWh) | 3000 |
| Renewable generation (kWh) | 2000 |
| Floor area (m²) | 90 |
| Energy price ($/kWh) | 0.25 |
| Result | Value |
|---|---|
| Estimated efficiency score | 61 / 100 |
| Energy per m² | 144.4 kWh |
| Energy band | Band D |
| Annual energy cost | $3,250 |
| Net energy use | 13,000 kWh |
| Score if heating cut 20% | 69 / 100 |
Values shown are produced by this page in your browser; change any input to update them.
How to use the EPC Rating Calculator
- Annual heating energy (kWh) — default 12000
- Annual electricity use (kWh) — default 3000
- Renewable generation (kWh) — default 2000
- Floor area (m²) — default 90
- Energy price ($/kWh) — default 0.25
- Press Calculate to update the results instantly.
Frequently asked questions
No. A formal EPC requires a survey of insulation, glazing, heating systems and airtightness. This tool gives a modelled estimate from energy consumption and floor area, useful for a quick sense of where a property sits.
A typical gas-heated home sits around 120–150 kWh per m². Well-insulated new builds often fall below 80, while older detached properties can exceed 200.
Loft and cavity wall insulation, draught proofing and heating controls usually give the largest gain per dollar. Solar generation improves the score and reduces running cost at the same time.