Calculator · October 2026 gas prices
Enter the facility’s dimensions and the size of the leak: we show the heat loss in kWh, gas and forints for one heating season, the estimated fix cost, the payback and the five-year balance – and whether a survey is worth ordering at all. The calculation runs in your browser; nothing is sent anywhere.
Pick a type, adjust the numbers and read the result.
Result
Identical to the Worked examples page (same model, same inputs). Worked examples →
Cost in one heating season
HUF 620,000
price range HUF 490–880k · with weather, efficiency and defect size (P10–P90): HUF 0.4–1.1M
Probably not worth it
The survey price alone exceeds what these defects save over five years. Probably not worth it for energy savings; other reasons (fabric protection, comfort, reliability) may still apply.
The verdict assumes such defects exist – which you cannot know before a survey. The survey price is the cost of finding out.
| year | Flat gas price (40.4 Ft/kWh) | Forward curve (falling) | Quick wins (A) only, flat price |
|---|---|---|---|
| 0 | −HUF 2.7M | −HUF 2.7M | −HUF 160k |
| 1 | −HUF 2.1M | −HUF 2.1M | +HUF 110k |
| 2 | −HUF 1.4M | −HUF 1.5M | +HUF 380k |
| 3 | −HUF 820k | −HUF 1.1M | +HUF 650k |
| 4 | −HUF 190k | −HUF 680k | +HUF 920k |
| 5 | +HUF 430k | −HUF 260k | +HUF 1.2M |
| Payback | ≈ 52 mo | no payback within 5 years | ≈ 7 mo |
| Case | Fault-free baseline | Leak | Total | Leak share |
|---|---|---|---|---|
| Medium | HUF 7.5M | HUF 620k | HUF 8.2M | 7.6% |
| Finding | Ft/season | Fix | Payback | |
|---|---|---|---|---|
| Dock 1: both side pads compressed (5.6 m × 30 mm) | 16,000 | 300,000 | 223 mo | C · slow |
| Dock 2: both side pads compressed (5.6 m × 30 mm) | 16,000 | 300,000 | 223 mo | C · slow |
| Dock 3: head curtain missing (2.6 m × 80 mm) | 21,000 | 300,000 | 171 mo | C · slow |
| Sectional door 1: worn perimeter seals (17 m × 8 mm) | 43,000 | 90,000 | 25 mo | B · medium |
| Sectional door 2: worn perimeter seals (17 m × 8 mm) | 43,000 | 90,000 | 25 mo | B · medium |
| Wall-panel joints open (35 m × 2 mm) | 270,000 | 160,000 | 7 mo | A · quick |
| Wet roof insulation (35 m²) | 190,000 | 770,000 | 50 mo | B · medium |
| Eaves / base thermal-bridge run (45 m) | 28,000 | 680,000 | 292 mo | C · slow |
Only the facility type and floor area are passed to the quote form – no personal data.
Three worked examples → · The calculation method →
Estimate – not a guarantee. Figures are model-based and actual values may differ.
How to read it
“Cost in one heating season” uses the central gas price; the “price range” shows the low and high gas price (32.1–56.9 Ft/kWh). “P10–P90” is wider: besides the price it covers the extremes of efficiency, weather and defect size. A single item is typically accurate to ±30–50%.
The five-year calculation uses two paths: today’s price held flat, and the falling curve of the futures market. A futures price is not a forecast; the two values are the upper and lower bound. With your own gas price the curve is scaled proportionally.
It does not know where or how large the defects in your facility are: it assumes that the defects you enter exist. A thermal survey is how to find out. Fix prices are indicative and not exact without a quote. Savings occur only if the repair is carried out.
The calculator works with assumptions. A thermal survey shows where the real defects are and how large.