Specifically 1013.2 btu per standard cubic foot, for pure methane.
1 Nm3=36308.96 btu
1 standard cubic foot of natural gas gives about 1030 BTU
For the purpose of gas rating 1040 btu's/ft3
Federal Energy Regulatory Commission
The average is about 20,000 BTU's per pound at standard temperature and pressure.
btu of natural gas to btu of propane
1 Nm3=36308.96 btu
102,000 BTU = 1 ccf
1 standard cubic foot of natural gas gives about 1030 BTU
Ther are 1,050 BTU in one cubic foot of natural gas.
For the purpose of gas rating 1040 btu's/ft3
natural gas
Federal Energy Regulatory Commission
The average is about 20,000 BTU's per pound at standard temperature and pressure.
138,700 btu's
Natural gas varies in its composition from one source to another. Consequently, the answer will vary.
In US units, one standard cubic foot of natural gas produces around 1,030 BTU.