joule per second  J/s  1 J/s  
watt  W  1 J/s  i watt
 SI base unit of power
In mechanical terms, one watt equals about 0.001 341 02 horsepower (hp) or 0.737 562 footpound per second (lbf/s). In electrical terms, one watt is the power produced by a current of one ampere flowing through an electric potential of one volt.

kilowatt  kW  1e+03 J/s  
megawatt  MW  1e+06 J/s  
kilojoule per hour  kJ/hr  2.77778e01 J/s  
kilogram force meter per second  kg_{f} • m/s  9.80665 J/s  
calorie per second  cal/s  4.1868 J/s  
calorie per hour  cal/hr  1.163e03 J/s  
British thermal units per second  BTU/s  1.05506e+03 J/s  
British thermal units per hour  BTU/hr  2.93072e01 J/s  
tons  Ton (RT)  3.51687e+03 J/s  i tons
 Unit of power used in refrigeration engineering. One ton of refrigeration is intended to be the power required to freeze one short ton of water at 0?C in 24 hours. This is assumed to be exactly 12 000 Btu per hour

metric horse power  pk (Metric hp)  7.35499e+02 J/s  i metric horse power
 Unit of power, defined to be the power required to raise a mass of 75 kilograms at a velocity of 1 meter per second. This is approximately 735.499 watts or 0.986 32 horsepower

horse power  hp  7.457e+02 J/s  i horse power
 Unit of power representing the power exerted by a horse in pulling

electric horse power  ehp  7.46e+02 J/s  i electric horse power
 Unit of power, equal to exactly 746 watts (550.221 foot pounds per second)

boiler horse power  bhp  9.8095e+03 J/s  i boiler horse power
 The boiler horsepower is defined to be the power required to convert 30 pounds (13.61 kilograms) per hour of water at 100 ?F (37.78 ?C) to saturated steam at a pressure of 70 pounds per square inch gauge (482.6 kilopascals gauge). This power, about 33 471 Btu per hour or 9.8095 kilowatts

pound force foot per second  lb_{f} • ft/s  1.35582 J/s  i pound force foot per second
 1 hose power = exactly 550 lb_{f} • ft/s
