C — equals one hundred (100).
Ccf — equals the volume of 100 cubic feet (cf) of natural gas.
M — equals one thousand (1,000).
MM — equals one million (1,000,000).
Mcf — equals the volume of 1,000 cubic feet (cf) of natural gas.
MMBtu — equals 1,000,000 British thermal units (Btu). (One Btu is the heat required to raise the temperature of one pound of water by one degree Fahrenheit.)
Therm — One therm equals 100,000 Btu, or 0.10 MMBtu.
In 2013, the average heat content of natural gas for the residential, commercial, and industrial sectors was about 1,025 Btu per cf; one Ccf = 102,500 Btu or 1.025 therms; one Mcf = 1.025 MMBtu or 10.25 therms.
You can convert prices from one basis to another:
$ per Ccf divided by 1.025 = $ per therm
$ per therm multiplied by 1.025 = $ per Ccf
$ per Mcf divided by 1.025 = $ per MMBtu
$ per Mcf divided by 10.25 = $ per therm
$ per MMBtu multiplied by 1.025 = $ per Mcf
$ per therm multiplied by 10.25 = $ per Mcf
Learn more:
Natural Gas Conversion Calculator
Source: US EIA- http://www.eia.gov/tools/faqs/faq.cfm?id=45&t=8
