AGA.org: How to Measure Natural Gas

1 cubic foot (cf) = 1,027 Btu
100 cubic feet (1 ccf) = 1 therm (approximate)
1,000 cubic feet (1 Mcf) = 1,027,000 Btu (1 MMBtu)
1,000 cubic feet (1 Mcf) = 1 dekatherm (10 therms)
1 million (1,000,000) cubic feet (1 Mmcf) = 1,027,000,000 Btu
1 billion (1,000,000,000 cubic feet (1 bcf) = 1.027 trillion Btu
1 trillion (1,000,000,000,000) cubic feet (1Tcf) = 1.027 quadrillion Btu

To put this in context:

— 1,000 cubic feet of natural gas is approximately enough to meet the natural gas needs of an average home (space-heating, water-heating, cooking, etc.) for four days.
(1000 cf = 28 м3 за 4 дня, 7 м3 в день)

— In 2009, the average American home consumed 70,500 cubic feet of natural gas (or 72.6 million Btu). On a daily basis, the average U.S. home used 193 cubic feet of natural gas.
(70,500 cubic feet = 1974 м3, 193 cubic feet = 5.4 м3)

— Most natural gas household bills display the amount of natural gas consumed by the ‘therm’ (100,000 Btu) or in hundreds of cubic feet (100 cubic feet — 1 Ccf).
(100 cubic feet = 2.8 м3)

— Looking at larger quantities, 1 billion cubic feet (Bcf) of natural gas is enough to meet the needs of approximately 10,000 — 11,000 American homes for one year.
(1 billion cubic feet = 28 000 000 м3)

— 5 trillion cubic feet of natural gas is enough to meet the needs of 5 million households for 15 years.
http://www.aga.org/KC/ABOUTNATURALGAS/ADDITIONAL/Pages/HowtoMeasureNaturalGas.aspx

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