Gas m³ ⇄ kWh converter
Belgian reference coefficients are pre-filled. Replace them with the ones on your own bill for an exact result.
Formula: m³ × conversion coefficient = kWh
Assumptions: coefficients of 11.6 kWh/m³ (high-calorific H gas) and 10.3 kWh/m³ (low-calorific L gas), CREG reference values retrieved on 18 August 2026. Default prices of €0.11/kWh all-in incl. VAT and €0.06/kWh for the energy component alone, orders of magnitude on the Belgian market in August 2026.
Informative estimate — not a settlement, not a quote, not advice. The exact coefficient changes every month and depends on your receiving station: only the one on your annual bill counts.
The formula, and where the coefficient comes from
m³ × conversion coefficient = kWh, and the reverse by division. The coefficient reflects the gross calorific value of the gas actually delivered. The CREG publishes two reference values: 11.6 kWh/m³ for high-calorific (H) gas and 10.3 kWh/m³ for low-calorific (L) gas. ORES reports a GCV of between 10.81 and 12.79 kWh/m³(n) on its network, and the CWaPE gives a range of 10 to 12 kWh per m³.
The coefficient printed on your annual bill is an average of the twelve monthly coefficients applied: that one, and only that one, counts. Sources accessed on 18 August 2026; prices per kWh recorded on the Belgian market in August 2026, to be re-checked before any decision.
Reference table
| Volume read | High-calorific (H) | Low-calorific (L) | Indicative cost at €0.11/kWh |
|---|---|---|---|
| 1 m³ | 11.6 kWh | 10.3 kWh | €1.28 |
| 10 m³ | 116 kWh | 103 kWh | €12.76 |
| 100 m³ | 1,160 kWh | 1,030 kWh | €127.60 |
| 500 m³ | 5,800 kWh | 5,150 kWh | €638.00 |
| 1,000 m³ | 11,600 kWh | 10,300 kWh | €1,276.00 |
| 1,250 m³ | 14,500 kWh | 12,875 kWh | €1,595.00 |
| 1,500 m³ | 17,400 kWh | 15,450 kWh | €1,914.00 |
| 2,000 m³ | 23,200 kWh | 20,600 kWh | €2,552.00 |
Frequently asked questions
How do you convert gas m³ into kWh?
Multiply your volume in m³ by the conversion coefficient on your bill: around 11.6 kWh/m³ for high-calorific (H) gas and 10.3 kWh/m³ for low-calorific (L) gas, per the CREG reference values. The regulator’s own example: 1,500 m³ × 11.6 = 17,400 kWh.
How do you convert gas kWh back into m³?
Divide your kWh by the conversion coefficient. For high-calorific gas at 11.6 kWh/m³, 17,000 kWh corresponds to 17,000 ÷ 11.6 = 1,465.5 m³.
Which coefficient applies in Belgium today?
The high-calorific (H) one. ORES now distributes high-calorific gas only, low-calorific gas having still circulated in some areas until 1 September 2024. The low-calorific coefficient is only useful for reading older bills.
Can this result be used to dispute a bill?
No. It is an estimate. The exact coefficient changes every month and depends on the aggregated receiving station: only the one printed on your annual bill counts, and it factors in volume allocation across the year.
What next?
Once you have your kWh, the real lever is no longer the calculation but the contract. Enter your annual consumption into our offer comparison tool, set it against the ranking of energy suppliers, and place it relative to average gas consumption in Belgium.
Informative estimate — not a quote, not an official calculation, not advice. No affiliate links.