CONVERSION TABLES
(SI units to US units & US units to SI units)

ENERGY

SI units to US units

Enter SI units in left column and click outside to get US units in right column.
Name
Symbol
SI unit
Multiplying Factor
US unit
Symbol
Name
kilojoule
kJ
0.9478
Btu
British thermal unit
joule
J
2.7778E-7
kW.h
kilowatt-hour
joule
J
0.7376
ft.lbf
foot-pound (force)
joule
J
1.0000
W.s
watt-second
joule
J
0.2388
cal
calorie
kilojoule
kJ
0.2778
W.h
watt-hour
megajoule
MJ
0.0353
hp.h
horsepower-hour

US units to SI units

Enter US units in left column and click outside to get SI units in right column.
Name
Symbol
US unit
Multiplying Factor
SI unit
Symbol
Name
British thermal unit
Btu
1.0551
kJ
kilojoule
kilowatt-hour
kW.h
3.6000E6
J
joule
foot-pound (force)
ft.lbf
1.3558
J
joule
Watt-second
W.s
1.0000
J
joule
calorie
cal
4.1877
J
joule
watt-hour
W.h
3.6000
kJ
kilojoule
horsepower-hour
hp.h
2.6845
MJ
megajoule

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This page is designed and maintained by Dr. K. Jayaraman. Comments are welcome.