Convert m³ Natural Gas to kWh
The value above comes from a published dataset (DEFRA, EPA, IPCC) that's revised about yearly. Get one email when this number changes: old → new, and what it means. No marketing.
A cubic metre of natural gas carries about 11.11 kWh on the gross basis, or 10.03 kWh on the net. If that first figure looks familiar, it should: it is essentially the conversion printed on a UK gas bill. Your meter counts cubic metres, your bill charges kilowatt-hours, and this multiplication is what sits between them — applied to millions of households every quarter, almost always unnoticed.
To convert cubic metres of natural gas to kilowatt-hours, multiply by 11.11 on the gross calorific value, or by 10.03 on the net. So 100 m³ is 1,111 kWh gross. Reversed, a kilowatt-hour is about 0.09 m³ of gas. UK bills use the gross basis.
kWh = m³ × calorific value per m³. Reverse: m³ = kWh ÷ calorific value. Note that no reference table publishes that per-cubic-metre figure directly — it is the fuel’s energy per kilogram multiplied by its density. Both are read live here, so the result restates itself when either does.
| Cubic metres | Gross (GCV) | Net (NCV) |
|---|---|---|
| 1 m³ | 11.11 kWh | 10.03 kWh |
| 100 m³ | 1,111 kWh | 1,003 kWh |
| 1,000 m³ | 11,110 kWh | 10,030 kWh |
| 10,000 m³ | 111,100 kWh | 100,300 kWh |
How to convert m³ of natural gas to kWh
Multiply by about 11.11 for gross, or 10.03 for net. A household getting through 100 m³ in a quarter has used roughly 1,111 kWh of gas — which is why the two numbers on a bill look so different in size, and why the volume figure alone tells you very little about the cost.
The anchor to remember is eleven: a cubic metre of gas is roughly eleven kilowatt-hours. If a conversion returns a kWh figure close to the cubic-metre figure, the multiplier has been left out.
kWh to m³ of natural gas
Divide by the same figure. 1,000 kWh is about 90 m³ of gas on the gross basis, or 100 m³ on the net. This direction is needed when a consumption figure arrives in energy — from a bill, a benchmark, or a reporting dataset — and has to be checked against a meter reading.
This is the conversion on your gas bill
UK suppliers do not bill on volume. They read the meter in cubic metres, then convert to kilowatt-hours before applying a unit rate, and both figures usually appear on the statement so the calculation can be followed.
| Step | What it is | Unit |
|---|---|---|
| Meter reading | Volume of gas that passed the meter | m³ |
| Volume correction | Adjustment for temperature and pressure | m³ |
| Calorific value | Energy content of the gas actually supplied | MJ/m³ |
| Billed consumption | What the unit rate is applied to | kWh |
Because a cubic metre of gas is not a fixed quantity of anything. Its energy content depends on the composition of the gas actually delivered — which varies by field, by network and over time — and on the temperature and pressure at the meter. Billing on volume would mean customers paying the same for materially different amounts of energy. Converting first makes the charge track what was actually supplied. The consequence for this page: the figure here is a published reference value, not your supplier’s number for your quarter. A supplier applies the calorific value of the gas in your network at the time; expect small differences.
Gross or net — and why the gap is wider for gas
The two calorific bases differ by almost ten per cent for natural gas, against roughly six per cent for diesel and five for petrol. Methane is hydrogen-rich, so burning it produces proportionally more water vapour — and the gross-versus-net question is precisely whether the energy carried away in that vapour is counted.
UK gas billing and UK reporting are on the gross basis, which is why this converter opens there — the figure most readers are reconciling against is their bill. International inventories compiled to IPCC guidance use net. Quoting a gas energy figure without saying which basis it is on leaves it ambiguous by nearly a tenth, and on gas that ambiguity is large enough to change conclusions about efficiency, benchmarking and year-on-year performance. Condensing boilers, incidentally, are the reason the distinction is not merely academic: they recover part of that vapour energy, which is how their efficiency can appear to exceed 100% when quoted on a net basis.
Where this conversion is needed
- Reconciling a meter against a bill — the most common reason anyone looks this up.
- Applying emission factors — the UK gas factor is published per kWh, so a volume reading has to cross over before it can be used. See the natural gas combustion methodology.
- Building energy benchmarking — intensity metrics are in kWh per square metre, while gas arrives as volume.
- Comparing gas against electricity or heat — only possible once both are in the same unit.
For the same gas by mass rather than energy, m³ of natural gas to kg. For the energy units themselves, kWh to GJ and kWh to therms — the therm being the older unit UK gas was billed in. For liquid fuels on the same energy basis, litres of diesel to kWh.
Gas produces emissions two quite different ways: burned it is stationary combustion producing mostly CO₂, while released unburned it is methane, with a far greater warming effect. For a reportable combustion figure use the stationary combustion calculator; for fugitive releases, the oil and gas methane calculator.
Frequently Asked Questions
About 11.11 kWh on the gross calorific value, or 10.03 kWh on the net. UK gas billing uses the gross basis, so 11.11 is the figure that corresponds to what appears on a bill.
Multiply cubic metres by about 11.11 for the gross basis. So 100 m³ is roughly 1,111 kWh. The anchor worth remembering is eleven — if your kWh figure comes out close to your cubic-metre figure, the multiplier has been left out.
Because the meter measures volume but the charge is applied to energy. Suppliers show the conversion so the calculation can be followed: meter reading in cubic metres, a correction for temperature and pressure, the calorific value of the gas actually supplied, and the resulting kilowatt-hours that the unit rate is applied to.
Because a cubic metre is not a fixed quantity of energy. Gas composition varies by field, by network and over time, and volume also shifts with temperature and pressure. Billing on volume would mean customers paying the same amount for materially different amounts of energy, so the conversion happens before the rate is applied.
It will be close, but not necessarily exact. This converter uses a published reference value, while your supplier applies the calorific value of the gas in your network for that period, along with a volume correction. Expect small differences — if the gap is large, the likely cause is a basis mismatch rather than an error in either figure.
Because methane is hydrogen-rich, so burning it produces proportionally more water vapour than burning a liquid hydrocarbon. Gross and net differ by whether the energy carried away in that vapour is counted, so a fuel that makes more of it has a wider gap — nearly ten per cent for natural gas, against about six for diesel and five for petrol.
It cannot, but it can look that way when efficiency is quoted against the net calorific value. A condensing boiler recovers some of the energy in the exhaust water vapour — energy the net basis excludes by definition — so the ratio of useful output to net input can exceed one. Quoted against gross, the figure stays below 100%.
About 90 m³ on the gross basis, or 100 m³ on the net. This is the direction needed when a consumption figure arrives in energy — from a bill, a benchmark or a reporting dataset — and has to be checked back against a meter reading.