natural gas cubic feet conversion

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unit conversion for BTU(volume) to cubic feet(ft^3)?in natural gas subject?

Your question is really not clear but I think this is what you want.

The BTU’s per cubic feet for natural gas varies depending on its actual composition. It if were pure methane then the heating values would be:

Net heating value = 909.1 BTU/cubic foot at 14.696 psia

Gross heating value = 1009.7 BTU/cubic foot at 14.696 psia

Natural gas typically contains some small amount of ethane, propane, butane and heavier hydrocarbons. These tend to raise the heating value.

There can also be contaminants like carbon dioxide and nitrogen which tend to lower the heating value because they contribute no energy when the gas is burned.