Conversion Factors
Energy and Power
 
 
Energy  
1 kWh 3.6 MJ
1 BTU 1.05506 kJ
1 Therm 105.506 MJ
1 cal 4.187 J
1 kcal 4.185 kJ
Power  
1 horsepower 0.7457 kW
1 boiler hp 9.803 kW
1 BTU/hr 0.293071 W
1 ton refrigeration 3.51685 kW
1 kcal/hr 1.163 W
Volume
1 barrel of oil 158.9873 litres
 
 
1e18     1,000,000,000,000,000,000     exa         E
1e15     1,000,000,000,000,000            peta        P
1e12     1,000,000,000,000                   tera         T
1e9       1,000,000,000                          giga        G
1e6       1,000,000                                 mega      M
1e3       1,000                                        kilo         k
1e2       100                                           hecto      h
1e1       10                                             deca       da
1e-1      0.1                                           deci        d
1e-2      0.01                                         centi        c
1e-3      0.001                                       milli         m
1e-6      0.000 001                                micro      µ
1e-9      0.000 000 001                         nano       n
1e-12    0.000 000 000 001                  pico        p
1e-15    0.000 000 000 000 001           femto      f
1e-18    0.000 000 000 000 000 001    atto         a

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