Natural Gas Energy Content Calculator
This calculator converts natural gas volumes to energy content using standard heating values published by the U.S. Energy Information Administration. The default higher heating value (HHV) of 1,037 BTU per standard cubic foot represents typical US pipeline-quality dry natural gas. Enter the gas volume and select your input unit to see energy in BTU, MMBtu, gigajoules, and therms.
Natural gas energy conversion formula
Energy (BTU) = Volume (scf) x HHV (BTU/scf)
Where scf = standard cubic feet at 60 degrees Fahrenheit and 14.73 psia (US standard conditions). Conversions: 1 MMBtu = 1,000,000 BTU = 1.05506 GJ = 10 Therms. Source: U.S. EIA Monthly Energy Review, Appendix A (conversion factors).
EIA standard conversion factors
| From | To | Factor |
|---|---|---|
| 1 Mcf (1,000 scf) | MMBtu | 1.037 |
| 1 MMBtu | GJ | 1.05506 |
| 1 Therm | BTU | 100,000 |
| 1 Therm | kWh | 29.3071 |
| 1 m3 natural gas | BTU | 35,301 (approx.) |
Natural gas energy content calculator: frequently asked questions
What is the energy content of natural gas?
The energy content of natural gas varies by composition but the U.S. EIA standard uses approximately 1,037 BTU per standard cubic foot (scf) or 1.037 MMBtu per Mcf (thousand cubic feet) for pipeline-quality dry natural gas. This is the higher heating value (HHV).
What is the difference between higher and lower heating value?
The higher heating value (HHV) includes the heat recovered when water vapor in the combustion products condenses. The lower heating value (LHV) excludes this, assuming water remains as vapor. HHV is used in commercial gas sales in the US; LHV is used in efficiency calculations in Europe. For natural gas, LHV is approximately 10% less than HHV.
What is an MMBtu?
An MMBtu (one million British Thermal Units) is the standard commercial unit for natural gas energy in North America. One MMBtu equals approximately 1,000 cubic feet (1 Mcf) of pipeline-quality natural gas, or 28.317 cubic metres, or 1.055 gigajoules (GJ).
What is a therm?
A therm is a unit of heat energy equal to 100,000 BTU (0.1 MMBtu). It is used in US retail natural gas billing. One therm is approximately 96.7 standard cubic feet of natural gas at 1,037 BTU/scf, or 29.307 kWh of energy.
Why does gas composition affect energy content?
Natural gas is primarily methane (CH4, 1,012 BTU/scf) but also contains ethane, propane, butane, and sometimes inert gases. Richer gas with more heavy hydrocarbons has a higher heating value. Lean pipeline gas is close to pure methane. The exact heating value for a given supply is determined by gas chromatography analysis.
Official sources
- U.S. Energy Information Administration (EIA): Natural Gas Energy Conversion Factors.
- EIA Monthly Energy Review, Appendix A: EIA Monthly Energy Review.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.