Conversion of units of energy

Conversion of units of energy

The SI unit for energy is the joule.

The kilowatt hour, or kilowatt-hour, (symbol kW·h, kW h or kWh) is equal to 3.6 megajoules.

The large calorie, kilogram calorie, dietary calorie or food calorie (symbol: Cal) approximates the energy needed to increase the temperature of 1 kilogram of water by 1 °C. This is about 4.182 kilojoules.

Tonne of oil equivalent:

The IEA/OECD define one toe to be equal to 41.868 GJ[1] or 11.63 MWh.

A gram of TNT releases 980–1100 calories upon explosion. To define the tonne of TNT, this was arbitrarily standardized by letting 1000 thermochemical calories = 1 gram TNT = 4184 J (exactly).[2]

Unit Exajoule 1018 J Petajoule 1015 J Terajoule 1012 J Gigajoule 109 J Megajoule 106 J Kilojoule 103 J joule
British thermal unit (BTU) 1.055 1,055
food calorie 4.182 4 182
1 Wh 3.6 3 600
1 kWh 3.6 3 600 3 600 000
1 MWh 3.6 3 600 3 600 000 3 600 000 000
1 GWh 3.6 3 600 3 600 000 3 600 000 000 3 600 000 000 000
1 TWh 3.6 3 600 3 600 000 3 600 000 000 3 600 000 000 000 3 600 000 000 000 000
1 PWh 3.6 3 600 3 600 000 3 600 000 000 3 600 000 000 000 3 600 000 000 000 000 3 600 000 000 000 000 000
1 Toe 41.868 41 868 41 868 000 41 868 000 000

References

See also



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