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Mcf to MMBtu
1 Mcf = 1.037 MMBtu, at the US average heating value of 1037 Btu per cubic foot. It moves with the heat content of your gas.
An Mcf is a volume of gas. An MMBtu is an amount of energy. Going between them needs the heat content of your particular gas, which is why the field below is editable rather than fixed.
Factors last reviewed
Volume and energy
Volume to volume is fixed arithmetic. Volume to energy is not: it depends on how much heat your gas actually carries, so the heating value is a field you can edit.
BOE uses the SEC and industry convention of 6 Mcf to one barrel. That is an energy equivalence at the burner tip and says nothing about relative value at the wellhead, where the ratio is rarely 6:1.
The 1037 Btu/scf default is EIA's 2025 US average. EIA notes that heat content shifts with location, with the type of customer, and over time. If you have a gas analysis, type its number in instead.
- scf
- 1,000
- Mcf
- 1
- MMcf
- 0.001
- Bcf
- 0.000001
- MMBtu
- 1.037
- therm
- 10.37
- GJ
- 1.0941
- BOE
- 0.166667
- Sm3
- 28.2623
- Nm3
- 26.7911
Methane and nitrous oxide to CO2e
Mass times global warming potential. The potential you use depends on what you are filing under, and the two US answers differ by 12 percent, so pick the one that applies to you.
Effective 1 January 2025. What the EPA Greenhouse Gas Reporting Program requires today.
One standard atmosphere. The scientific and API base.
The list holds the two values US rules actually require. IPCC AR6 gives 29.8 for fossil methane, 27.0 for non-fossil, and 273 for nitrous oxide (IPCC AR6 Working Group I, Table 7.15). Fossil is the one covering oil and gas leaks. Why it is not in this list.
- Gas mass
- 1
- tonnes
- CO2e
- 28
- tonnes CO2e
- CO2e
- 28,000
- kg CO2e
- Multiplier used
- 28
- GWP, 100-year
Volume inputs assume pure gas at 60 °F and the pressure base you picked, against a molar mass of 16.043 for methane. The base matters: Texas reports at 14.65 psia, so running RRC volumes through the 14.696 default overstates mass, and CO 2e with it, by about 0.31 percent. Real pipeline gas is also a mixture, so a measured mass will beat this for anything you have to defend.
Emission rate
A leak survey reports grams or kilograms an hour. A permit is written in tonnes a year. An engineer thinks in scfh. Same leak, three vocabularies.
Annualised at 8,760 hours, and volume rates cross to mass through the same standard-condition density the CO2e panel uses, so a leak quoted in scfh and the same leak in kg/hr cannot disagree.
- kg/hr
- 1
- g/hr
- 1,000
- kg/day
- 24
- t/yr
- 8.76
- scfh
- 52.148
- Mcf/d
- 1.2516
Mcf to MMBtu formula
MMBtu = Mcf x 1,000 x (Btu per cubic foot) / 1,000,000
The factor is the part worth checking. It is a field in the calculator above, and its source is named on the full converter.
Mcf to MMBtu chart
| Mcf | MMBtu |
|---|---|
| 0.1 | 0.1037 |
| 0.5 | 0.5185 |
| 1 | 1.037 |
| 2 | 2.074 |
| 5 | 5.185 |
| 10 | 10.37 |
| 25 | 25.925 |
| 50 | 51.85 |
| 100 | 103.7 |
| 250 | 259.25 |
| 500 | 518.5 |
| 1,000 | 1,037 |
| 2,500 | 2,593 |
| 5,000 | 5,185 |
| 10,000 | 10,370 |
Frequently asked questions
How many MMBtu is 1 Mcf of natural gas?
1.037 MMBtu at the 1037 Btu per cubic foot US average, and 0.96432 Mcf coming back the other way. Both figures track the heat content of the specific gas, so a richer stream converts to more energy per unit volume and a diluted one to less.
Is the Mcf to MMBtu conversion always the same?
No. It tracks the heat content of the gas, which varies with composition. Wet gas rich in ethane and propane converts to more MMBtu per Mcf; gas diluted with nitrogen or carbon dioxide converts to less. Colorado wells measure a median around 17 percent above the national average, so the difference is not academic.
Why is gas sold in MMBtu but produced in Mcf?
A buyer is purchasing energy, and two Mcf from different fields do not carry the same energy. Production is metered by volume because that is what a meter measures, and sales settle on heat content because that is what the gas is worth.