The U.S. Energy Information Administration (EIA) has resources for converting data for energy, fuels, and electricity in physical units to heat content equivalents. EIA also has resources for converting English units to metric units:
EIA usually publishes petroleum data in physical units such as barrels or barrels per day. Barrels per day are calculated as the total number of barrels (produced, imported, exported, or consumed) during a calendar period (week, month, or year) divided by the number of days in the calendar period. There are 42 U.S. gallons in a barrel.
Energy units and calculators
Last updated: July 9, 2019