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Power converters

11 converters. Watts, kilowatts, horsepower and BTU per hour, each with the formula and the math worked out with your numbers.

Engines & motors

Horsepower to kilowatts hp → kW 150 hp = 111.85 kW Kilowatts to horsepower kW → hp 100 kW = 134.1 hp Watts to horsepower W → hp 750 W = 1.01 hp Horsepower to watts hp → W 2 hp = 1,491.4 W Metric horsepower to kilowatts PS → kW 150 PS = 110.32 kW Kilowatts to metric horsepower kW → PS 100 kW = 135.96 PS Metric horsepower to horsepower PS → hp 100 PS = 98.63 hp

Heating & cooling

BTU per hour to watts BTU/h → W 12,000 BTU/h = 3,516.85 W Watts to BTU per hour W → BTU/h 1,500 W = 5,118.21 BTU/h Tons of refrigeration to kilowatts TR → kW 3 TR = 10.55 kW Kilowatts to tons of refrigeration kW → TR 10 kW = 2.84 TR

Power units at a glance

Unit Symbol In watts Defined as
Watt W 1 1 J/s
Kilowatt kW 1,000 1,000 W
Megawatt MW 1,000,000 1,000 kW
Horsepower hp 745.699872 550 lbf·ft/s
Metric horsepower PS 735.49875 75 kgf·m/s
BTU per hour BTU/h 0.293071 1 BTU per hour
Ton of refrigeration TR 3,516.852842 12,000 BTU/h