Tonne of oil equivalent

Multiples of the toe are used, in particular the megatoe (Mtoe, one million toe) and the gigatoe (Gtoe, one billion toe). A smaller unit of kilogram of oil equivalent (kgoe or koe) is also sometimes used denoting 1/1000 toe.

A related concept is the physical quantity oil-equivalent mass (or mass of oil equivalent), expressed in the ordinary units of mass and its multiples: kilogram (kg), megagram (Mg) or tonne (t), etc.

Definitions

The International Energy Agency defines one tonne of oil equivalent (toe) to be equal to:

• 1 toe = 11.63 megawatt-hours (MWh)
• 1 toe = 41.868 gigajoules (GJ)
• 1 toe = 10 gigacalories (Gcal) – using the international steam table calorie (cal_IT) and not the thermochemical calorie (cal_th)
• 1 toe = 39,683,207.2 British thermal units (BTU)
• 1 toe = 1.42857143 tonnes of coal equivalent (tce)

Conversion into other units:

• 1 toe = 7.33 barrels of oil equivalent (boe)

Some other sources and publications use divergent definitions of toe, for example:

• 1 toe = 10.7 gigacalories (Gcal) – using the thermochemical calorie
• 1 toe = 41.85 gigajoules (GJ)
• 1 toe = 44.769 gigajoules (GJ) – based on using thermochemical calorie (cal_th)
• 1 toe = 39,683,205.411 British thermal units (BTU)