MMBtu stands for "Metric Million British Thermal Unit" and is a unit of measurement traditionally used to measure heat content or energy value. It is commonly used in the natural gas and oil industries to indicate 1,000,000 BTUs. A BTU (British Thermal Unit) is a measure of heat, which is a form of energy. It was originally defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

MMBtu is a measure of energy content for crude oil and refined products, and a volume measurement for natural gas. It is distinct from pure volumetric units in that it assumes a certain energy content of the gas. In the United States, natural gas can be priced in units of dollars per therm, dollars per MMBtu, or dollars per cubic feet.

To convert natural gas units, one therm equals 100,000 Btu, or 0.10 MMBtu. The conversion/comparison between scm and MMBtu can be done based on 1 MMBtu = 252,000 KiloCalorie.