BTU · Therm · MCF · Energy & Volume Units
Standard conditions (US vs ISO), actual vs standard volume, mass-volume relationships, and custody transfer considerations
MCF is converted to MMBtu by multiplying the gas volume by its heating value and dividing by 1,000,000. Using the standard heating value of 1,020 BTU/scf, 1 MCF equals approximately 1.02 MMBtu. The exact factor depends on the actual gas composition.
CCF is 100 cubic feet (centum cubic feet), MCF is 1,000 cubic feet (mille cubic feet), and MMCF is 1,000,000 cubic feet. These volume units are standard for gas utility billing (CCF), production reporting (MCF), and pipeline throughput (MMCF/MMSCFD).
One standard cubic foot equals 0.02832 standard cubic meters. Conversion must account for different base conditions: US standard is 60°F/14.73 psia while ISO standard is 15°C/101.325 kPa, requiring a small correction factor between the two reference states.
One Dekatherm (Dth) equals exactly 1 MMBtu or 1,000,000 BTU. Dekatherms are commonly used in US natural gas pipeline tariffs and commercial gas contracts as the standard energy billing unit.