MMcf (Million Cubic Feet)
MMcf means one million cubic feet of natural gas — that's 1,000 Mcf. It sits on the Mcf / MMcf / Bcf ladder of gas volume units you'll see on production reports and royalty statements.
MMcf stands for one million cubic feet of natural gas. The naming follows the old Roman-numeral convention where M means thousand, so the units stack like this:
- Mcf = one thousand cubic feet (M × cf) — see Mcf
- MMcf = one million cubic feet (M × M × cf) = 1,000 Mcf
- Bcf = one billion cubic feet = 1,000 MMcf
- Tcf = one trillion cubic feet
You'll also see the standard variants — Mscf (thousand standard cubic feet, the same as Mcf) and MMscf (million standard cubic feet, the same as MMcf) — which just specify the gas is measured at standard temperature and pressure. A flow rate is written per day, e.g. MMcf/d.
MMcfe ("e" for equivalent) rolls gas and liquids into one gas-equivalent figure, the gas-side cousin of the barrel of oil equivalent, typically converting at 6 Mcf per barrel. On a royalty statement your gas volume usually appears in Mcf, while reserve and well-productivity reports lean on MMcf and Bcf because the numbers are larger.