Natural Gas Energy Conversions: MCF, Therms, GJ, Flow Rates & Cost
Base: 14.73 psia, 60°F (default US EIA)
Understand gas measurement principles, heating values, and industry standards
Natural gas volume (MCF) and energy content (MMBTU) are related by the gas heating value. While volume measures physical space, energy measures the heat generated.
MMBTU = MCF × (BTU/cf / 1000)Therms = MCF × (BTU/cf / 100)1 MMBTU = 1.055056 GJBased on a standard heating value of 1,038 BTU/scf:
1 MMBTU = 1 Dekatherm = 10 Therms
1 MMBTU = 1.055056 GJ
1 MCF ≈ 1.038 MMBTU (at 1038 BTU/cf)
1 m³ = 35.3147 ft³
1 Nm³ = 1.0549 Sm³
1 BCF = 28.317 MSm³
| Standard | T | P |
|---|---|---|
| US (EIA) | 60°F | 14.73 psia |
| US (GPA) | 60°F | 14.696 psia |
| ISO/Sm³ | 15°C | 101.325 kPa |
| Nm³ | 0°C | 101.325 kPa |
| Gas | BTU/scf |
|---|---|
| Pipeline Avg | 1,038 |
| Pure Methane | 1,010 |
| Ethane | 1,770 |
| Propane | 2,516 |
Sources: GPA 2145-16, GPA 2172-19, ISO 6976:2016, ASTM D3588, EIA Natural Gas Monthly. Heating values vary by composition—contact your gas supplier for actual values.
Get the BTU per cubic foot of your natural gas from your gas analysis or pipeline tariff. Pipeline-quality gas is typically 1,000–1,050 BTU/cf. Default value used by EIA and most billing systems: 1,038 BTU/cf.
Multiply MCF by (BTU/cf ÷ 1,000) to get MMBTU.
MMBTU = MCF × (BTU/cf ÷ 1,000)
For pipeline-quality gas at 1,038 BTU/cf: 1 MCF × (1,038 ÷ 1,000) = 1.038 MMBTU. Pure methane: ~1.010 MMBTU. High-BTU rich gas: up to ~1.100 MMBTU. Always use your gas's actual heating value for billing-grade accuracy.
1 MCF of natural gas contains approximately 1.038 MMBTU based on average pipeline quality gas (1,038 BTU/cf). However, this value can vary between 1.010 MMBTU (pure methane) and over 1.100 MMBTU depending on the gas composition.
MCF stands for "thousand cubic feet" of natural gas. It's a volumetric measurement unit where 1 MCF = 1,000 cubic feet. MCF is commonly used in natural gas billing and production reporting.
Formula: MMBTU = MCF × (BTU per cubic foot ÷ 1,000). For pipeline quality gas: 1 MCF × 1,038 ÷ 1,000 = 1.038 MMBTU. The heating value (BTU/cf) varies by gas composition, so use your actual gas analysis when available.
MCF = 1,000 cubic feet, while CCF = 100 cubic feet. Therefore, 1 MCF = 10 CCF. MCF is used for larger commercial/industrial accounts, while CCF appears on most residential gas bills.
1,000 cubic feet (1 MCF) of natural gas contains approximately 1,038,000 BTU or 1.038 MMBTU based on average pipeline quality gas. Pure methane contains 1,010,000 BTU per MCF.