1 Billion Barrels of Oil, page-5

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.
• 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.
• 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).
• 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.
• 5 trillion cubic feet of natural gas is enough to meet the needs of 5 million households for 15 years.