An abbreviation denoting a thousand cubic feet of natural gas. A natural gas well that produces 400 Mcf of gas per day operates with a daily production rate of 400,000. A single Mcf is equal to approximately 1,000,000 Btu (British thermal units) of energy. The "M" in MCF comes from the ancient Roman letter M, which stood for one thousand. One million cubic feet is instead denoted as MMcf.


Different energy sources yield different outputs for an equivalent amount of resource. Coal, for example produces 25 million Btu of energy per ton while oil produces 5.6 million Btu per barrel. One Btu is the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit.

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