Million cubic feet per day...unit mostly used for natural gas
Multiply mmcfd by 1,000
20,000,000
The mm (usually capitalized as in "MM") stand for million. cfm stands for cubic feet per minute. So MMcfm stands for million cubic feet per minute.As a side note you may also see MMscfm which stands for "million standard cubic feet per minute," which uses the gas density at the reference temperature of exactly 60 degrees Fahrenheit. This may be different than the actual density, but it provides a way to distinguish exactly how much gas is flowing independent of temperature.