per million BTU
Cost per energyexact by definition
Cost per million BTU is the wholesale energy pricing convention, the unit in which natural gas futures, industrial fuel contracts and cross-fuel comparisons are quoted. One million international table BTU is exactly 1,055,055,852.62 joules, so the conversion is exact by definition. One MMBTU equals exactly 10 therms and about 293.07 kilowatt-hours.
Watch out: The M in MMBTU is the Roman numeral for a thousand used twice, so MMBTU means a million BTU while MBTU in the same convention means a thousand. Elsewhere MBTU is written meaning a million, following the SI mega prefix, so the abbreviation is genuinely ambiguous and worth confirming. There are also several BTU definitions differing by up to about 0.2 percent; this site uses the international table BTU of exactly 1055.05585262 joules.
| 1 $/MMBTU | 0.0034121416 $/kWh |