Unit converter

Power converter

Convert watts, kilowatts, horsepower, BTU per hour, and mechanical power units.

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Decimals

Amount From unit

Result To unit

1 hp(I) = 0.7456998716 kW

All Power units

From 1 hp(I)

Unit	Value
Watt W	745.6998715823
Kilowatt kW	0.7456998716
Megawatt MW	0.0007456999
Milliwatt mW	745,699.8715822703
Mechanical horsepower hp(I)	1
Metric horsepower PS	1.0138696654
BTU (IT) per hour BTU/h	2,544.433577644
Foot-pound per second ft·lb/s	550

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Common tasks

Popular power conversions

Mechanical horsepower to Kilowatthp(I) to kW Kilowatt to Mechanical horsepowerkW to hp(I) Watt to BTU (IT) per hourW to BTU/h Megawatt to KilowattMW to kW Metric horsepower to WattPS to W BTU (IT) per hour to WattBTU/h to W

Reference

How power conversion works

Power is the rate of energy transfer. Mechanical and metric horsepower are different units, so both are labeled rather than collapsed into a generic horsepower value.

Values are converted to watt first, then from that reference into the requested unit. Keeping a single documented reference reduces inconsistent pair-by-pair constants.

Accuracy note: Horsepower type is always identified because mechanical and metric horsepower differ by about 1.4 percent.

Unit reference

Unit	Symbol	1 unit in W
Watt	W	1
Kilowatt	kW	1,000
Megawatt	MW	1,000,000
Milliwatt	mW	0.001
Mechanical horsepower	hp(I)	745.69987158227
Metric horsepower	PS	735.49875
BTU (IT) per hour	BTU/h	0.293071070172
Foot-pound per second	ft·lb/s	1.355817948331

Long-tail directory

Every indexed conversion

Choose a source unit to see all available destinations.

From Watt (W)

Watt to Kilowatt Watt to Megawatt Watt to Milliwatt Watt to Mechanical horsepower Watt to Metric horsepower Watt to BTU (IT) per hour Watt to Foot-pound per second

From Kilowatt (kW)

Kilowatt to Watt Kilowatt to Megawatt Kilowatt to Milliwatt Kilowatt to Mechanical horsepower Kilowatt to Metric horsepower Kilowatt to BTU (IT) per hour Kilowatt to Foot-pound per second

From Megawatt (MW)

Megawatt to Watt Megawatt to Kilowatt Megawatt to Milliwatt Megawatt to Mechanical horsepower Megawatt to Metric horsepower Megawatt to BTU (IT) per hour Megawatt to Foot-pound per second

From Milliwatt (mW)

Milliwatt to Watt Milliwatt to Kilowatt Milliwatt to Megawatt Milliwatt to Mechanical horsepower Milliwatt to Metric horsepower Milliwatt to BTU (IT) per hour Milliwatt to Foot-pound per second

From Mechanical horsepower (hp(I))

Mechanical horsepower to Watt Mechanical horsepower to Kilowatt Mechanical horsepower to Megawatt Mechanical horsepower to Milliwatt Mechanical horsepower to Metric horsepower Mechanical horsepower to BTU (IT) per hour Mechanical horsepower to Foot-pound per second

From Metric horsepower (PS)

Metric horsepower to Watt Metric horsepower to Kilowatt Metric horsepower to Megawatt Metric horsepower to Milliwatt Metric horsepower to Mechanical horsepower Metric horsepower to BTU (IT) per hour Metric horsepower to Foot-pound per second

From BTU (IT) per hour (BTU/h)

BTU (IT) per hour to Watt BTU (IT) per hour to Kilowatt BTU (IT) per hour to Megawatt BTU (IT) per hour to Milliwatt BTU (IT) per hour to Mechanical horsepower BTU (IT) per hour to Metric horsepower BTU (IT) per hour to Foot-pound per second

From Foot-pound per second (ft·lb/s)

Foot-pound per second to Watt Foot-pound per second to Kilowatt Foot-pound per second to Megawatt Foot-pound per second to Milliwatt Foot-pound per second to Mechanical horsepower Foot-pound per second to Metric horsepower Foot-pound per second to BTU (IT) per hour

Primary source

Definitions and standards

Conversion constants and definitions for this category are checked against NIST SP 811: Power units.

See Methods & sources for rounding rules, exact-value handling, and review policy.

Questions

Power FAQ

What is the reference unit for power conversions?

ConvertWin uses watt (W) as the internal reference for this category, then converts to the selected output unit.

How accurate is this power converter?

Horsepower type is always identified because mechanical and metric horsepower differ by about 1.4 percent.