Convert Energy Units

change from one to another energy unit

The tables below show the conversion factors for converting between different units of energy and typical calorific values of fuels.
Energy Conversion Factors

	Unit	x	Factor	=	S.I. Unit	x	Factor	Unit
Energy	therm	x	105.506	=	MJ	x	0.00948	therm
	hp h	x	2.684	=	MJ	x	0.3726	hp h
	kWh	x	3.6	=	MJ	x	0.2778	kWh
	Btu	x	1.05506	=	kJ	x	0.9478	Btu
	therm	x	29.31	=	kWh	x	0.03412	therm

Power	hp	x	0.7457	=	kW	x	1.341	hp
	Btu/h	x	0.2931	=	W	x	3.412	Btu/h

Convert to kWh

The following table gives the number you need to multiply by to get from a variety of different units to kWh (note that some of these are specific to certain fuel types).

Unit	=	kWh
1 tonne of oil equivalent	=	11,630 kWh
1 therm	=	29.31 kWh*
1 Giga joule (Gj)	=	277.8 kWh
1 British thermal unit (BTU)	=	0.00029 kWh
1 cubic foot natural gas	=	0.313 kWh*
1 cubic metre natural gas	=	11.06 kWh*
1 litre fuel oil	=	11.69 kWh*

*derived from Digest of UK Energy Statistics 2003

Typical heat content of common fuels

Where fuels are purchased or measured by volume or weight the calorific value of the fuel is needed to convert to energy units. This should be specified by the fuel supplier, but where this data is not available the typical values given below can be used (all figures from Digest of UK Energy Statistics 2003 table A.1 estimated average gross calorific values of fuels).

		Gross calorific value
Fuel Oil	Kerosene	28 sec	46.2 MJ/kg
	Gas/diesel Oil	35 sec	45.6 MJ/kg
	Fuel Oil		43.4 MJ/kg
Liquid Petroleum Gas (LPG)		Butane	49.4 MJ/kg
Natural Gas			39.8 MJ/m3

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Convert Energy Units

change from one to another energy unit

Convert to kWh

Typical heat content of common fuels