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Symbol:  W 
Category:  Power (Heat flow) 
SI Equivalent:  1 W
Dimension ML2T-3 
System:  SI 
Named in honor of the Scottish inventor James Watt (1736-1819), the watt is the unit of power in the SI system. It is equal to 1 joule of work produced per second.
Convert     W  
1 W =
Power (Heat flow)
  Symbol Unit Name
10×106  aW  abwatt (emu of power) 
3.41214  Btu (IT)/h  British thermal unit (IT) per hour 
5.6869×10-2  Btu (IT)/min  British thermal unit (IT) per minute 
9.47817×10-4  Btu (IT)/s  British thermal unit (IT) per second 
3.41443  Btu (therm.)/h  British thermal unit (therm.) per hour 
5.69071×10-2  Btu (therm.)/min  British thermal unit (therm.) per minute 
9.48452×10-4  Btu (therm.)/s  British thermal unit (therm.) per second 
859.858  cal (IT)/h  calorie (IT) per hour 
14.331  cal (IT)/min  calorie (IT) per minute 
0.238849  cal (IT)/s  calorie (IT) per second 
616.438  cal (therm.)/h  calorie (therm.) per hour 
14.3403  cal (therm.)/min  calorie (therm.) per minute 
0.239006  cal (therm.)/s  calorie (therm.) per second 
1.35962×10-3  cv, HP  cheval-vapeur (horsepower) 
10×106  dyn-cm/s  dyne-centimeter per second 
10×106  erg/s  erg per second 
2655.22  ft-lbf/h  foot-pound force per hour 
44.2537  ft-lbf/min  foot-pound force per minute 
0.737562  ft-lbf/s  foot-pound force per second 
23.7304  ft-pdl/s  foot-poundal per second 
1.34102×10-3  HP  horsepower (550 ft-lbf/s) 
1.01942×10-4  HP  horsepower (boiler) 
1.34102×10-3  BHP, hp  horsepower (British) 
1.35962×10-3  cv, HP  horsepower (cheval-vapeur) 
1.35962×10-3  HP  horsepower (metric) 
1.34041×10-3  HP  horsepower (water) 
0.101972  kgf-m/s  kilogram force-meter per second 
1×10-3  kW  kilowatt 
1.01972×10-2    prony 
2.54927×10-4  CTR (UK)  ton (refrigeration, UK) 
2.84349×10-4  CTR (US)  ton (refrigeration, US) 
VA  volt-ampere 
0.99981  W  watt (int. mean) 
0.999835  W  watt (int. US)