1 cubic foot is equal to 0.02833 m3. If we do a bit of math, we see that: 1 m3 of natural gas is equal to 0.0366 MMBTU. 1 MMBTU is equal to 27.3192 m3. That means that we can use these two MMBTU to m3 and m3 to MMBTU formulas: m3 = MMBTU × 27.3192 MMBTU = m3 × ...