Conversion Factors

Heat and other Energy

These factors use the tonne of oil equivalent (toe) as the common unit of energy for comparing and aggregating fuels. The following table gives factors for conversion between this unit and alternative units of energy found in other publications. To convert from the units on the left hand side to the

units across the top, multiply the values in the table.

 Conversion from: To: Thousand toe: Terajoules GWh Million therms Multiply by Thousand toe 1 41.87 11.63 0.3968 Terajoules 0.02388 1 0.2778 0.0009478 GWh 0.08598 3.6 1 0.03412 Million therms 2.52 105.5 29.31 1

 1 tonne of oil equivalent (toe) = 107 kilocalories   = 396.8 therms   = 41.87 GJ   = 11,630 kWh 1 therm = 100,000 British thermal units (Btu)

The following prefixes are used for multiples of joules, watts and watt-hours:

kilo (k)                        = 1,000 or 10e3

mega (M)                      = 1,000,000 or 10e6

giga (G)                       = 1,000,000,000 or 10e9

tera (T)                       = 1,000,000,000,000 or 10e12

peta (P)                       = 1,000,000,000,000,000 or 10e15

exa (E)                        = 10e18

Power

 To: KW BTU/hr Therm/hr Kcal/h Ton of refrigeration Horsepower Conversion from: Multiply by kW 1 3412 0.03412 859.8 0.2843 1.3410 BTU/hr 0.0002931 1 0.00001 0.2520 0.00008334 0.0003931 Therm/hr 29.31 100000 1 25202 8.334 39.31 Kcal/h 0.001163 3.9679 0.00003968 1 0.0003307 0.001560 Ton of refrigeration 3.517 12000 0.12 3024 1 4.716 Horsepower 0.7457 2544.2 0.02544 641.2 0.2120 1