Conversion factors for units of energy (2024)

Conversion Factors for Units of Energy

The most common energy unit is the kilowatt hour. However, different units are used in energy statistics. This overview summarises the most important units and 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. A specialized calculator assists at these calculations.

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Conversion factors for units of energy part 1

	kJ	kcal	kWh
1 kJ	1	0.2388	0.000278
1 kcal	4.1868	1	0.001163
1 kWh	3 600	860	1
1 kg SKE	29 308	7 000	8,14
1 kg oe	41 868	10 000	11,63
1 m³ natural gas	31 736	7 580	8.816

Conversion factors for units of energy part 2

	kg SKE	kg RÖE	m³ natural gas
1 kJ	0.000034	0.000024	0.000032
1 kcal	0.000143	0.0001	0.00013
1 kWh	0.123	0.086	0.113
1 kg SKE	1	0.7	0.923
1 kg oe	1.428	1	1.319
1 m³ natural gas	1.083	0.758	1

Units of energy overview part 1

Unit	Name
J	Joule
cal	Calorie
Wh	Watt hour
(kg) SKE	(kilogram) Coal equivalent
(kg) RÖE	(kilogram) Oil equivalent
oe oder OE	Oil equivalent
m³ Erdgas	cubic meter natural gas
BTU	British thermal unit
kpm	Kilogram force meter (Kilopondmeter)
erg	Erg
eV	Electron volt

Units of energy overview part 2

Unit	Conversion in kJ or kWh
J	1 000 J = 1 000 Ws = 1 kJ
cal	1 000 cal = 1 kcal = 4,186 kJ
Wh	1 Wh = 3,6 kJ
(kg) SKE	1 kg SKE = 29 308 kJ
(kg) RÖE	1 kg RÖE = 41 868 kJ
oe oder OE	1 (kg) oe = 41 868 kJ
m³ natural gas	1 m³ Erdgas = 31 736 kJ
BTU	1 BTU = 0.000293071 kWh = 1.05506 kJ
kpm	1 kpm = 2.72·10^-6 kWh = 0.00980665 kJ
erg	1 erg = 2.78·10^-14 kWh = 1·10^-10 kJ
eV	1 eV = 1.60217733·10^-19 J = 1.60217733·10^-22 kJ