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Environmental Awareness

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Energy Saving

Energy Units

Conversion Factors

J (joule) and Ws (watt second) are the valid SI units for energy. Nevertheless, in the energy sector a lot of other units are used. This overview describes the most important units of energy and their conversion factors. 

Conversion factors for units of energy

  kJ kcal kWh kg ce kg oe m³ natural gas
1 kJ 1 0.2388 0.000278 0.000034 0.000024 0.000032
1 kcal 4.1868 1 0.001163 0.000143 0.0001 0.00013
1 kWh 3 600 860 1 0.123 0.086 0.113
1 kg ce 29 308 7 000 8.14 1 0.7 0.923
1 kg oe 41 868 10 000 11.63 1.428 1 1.319
1 m³ natural gas 31 736 7 580 8.816 1.083 0.758 1

 

Units of energy overview

Unit Name Conversion to kJ or kWh
J joule 1 000 J = 1 000 Ws = 1 kJ
cal calorie 1 000 cal = 1 kcal = 4.186 kJ
Wh watt hour 1 Wh = 3.6 kJ
(kg) ce (kilogram) coal equivalent 1 kg ce = 29 308 kJ
(kg) oe (kilogram) oil equivalent 1 kg oe = 41 868 kJ
m³ natural gas cubic meter natural gas 1 m³ natural gas = 31 736 kJ
BTU British Thermal Unit 1 BTU = 0.000293071 kWh = 1.05506 kJ
kpm kilogram force meter (Kilopondmeter) 1 kpm = 2.72e-6 kWh = 0.00980665 kJ
erg erg 1 erg = 2.78e-14 kWh = 1e-10 kJ
eV elektron volt 1 eV = 1.60217733e-19 J = 1.60217733e-22 kJ
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