"Can anyone tell me the conversion to kilo?"Natural gas is...

"Can anyone tell me the conversion to kilo?"

Natural gas is priced at the Henry Hub in terms of energy value at say, US$3/million BTUs.
The energy value of methane is 23,900 BTU/pound.

So the price in USD per kilogram would be roughly as follows
3/1,000,000 $/BTU x 23,900 BTU/pound x 2.2 pound/kg = US$0.157 /kg.

Natural gas is not pure methane but rather a variable mixture of gases, that is why it is sold on an energy yield basis.
So if it's methane that you need, the methane component excluding the rest will be somewhat more expensive than natural gas..

Alternatively, if methane is being sold per cubic foot, one cubic metre of methane at standard pressure weighs 0.657 kg/m^3.
So one cubic foot weighs 0.657kg/m^3 X 0.3048^3 = 0.0186kg.
So to get the price per kg, multiply the price per cubic foot by 1/0.0186 = 53.8
Or more likely, multiply the price per 1,000 cubic feet by 0.0538 to get the price per kg.

So if the price is US$3.00 per thousand cubic feet, that equates to US$0.161 /kg provided that it is methane that you are buying.

if the product on offer is only 80% methane, and it's only the methane that you want, then the effective price for the methane would be 25% higher than indicated above plus your processing costs.

Cheers