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