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CCF and MCF are standardized units of measurement of natural gas. The initial C in the term "CCF" is the Roman numeral for 100; "CCF" means 100 cubic feet. The initial M in the term "MCF" is the Roman numeral for 1,000: "MCF" means 1,000 cubic feet. Here's a quick primer of Roman numerals: I = 1; V = 5; X = 10; L = 50; C = 100; D = 500; and M = 1,000. If you know this, and keep in mind that the "CF" in "CCF" and "MCF" stands for "cubic feet," you're already halfway to making the conversion from CCF to MCF.

Write down the CCF number that you want to convert. For an example, let's use 1,000 CCF.

Divide this number by 10 and this will yield the MCF. For example, 1000/10 = 100.

To convert the MCF figure to CCF, multiply the MCF number by 10.