KW to HP and HP to KW Converter – Kilowatts to Horsepower

Need to convert kW to HP for an electric motor, or find the HP to kW figure for a car engine? This bidirectional horsepower to kw calculator and horsepower to kilowatts converter delivers the result immediately. Kilowatts are the international standard unit of power used in science and engineering. Horsepower remains the preferred unit for automotive and industrial equipment in the US and UK. The two units measure identical physical quantities, so converting between them is straightforward once you know the right formula for your horsepower type. Read on for formulas, conversion tables, and real-world examples covering automotive, electric vehicle, and industrial motor applications.

HP to KW Conversion Formula

To convert horsepower to kilowatts, multiply the HP value by the appropriate conversion factor. The factor depends on which type of horsepower you are working with:

• Mechanical (Imperial) HP to kW: kW = HP x 0.7457
• Electrical HP to kW: kW = HP x 0.746
• Metric HP (PS/CV) to kW: kW = HP x 0.7355

Example: a 200 HP mechanical engine produces 200 x 0.7457 = 149.14 kW.

Mechanical horsepower is the standard for US and UK vehicles, machinery, and appliances. Metric horsepower (PS) is used by German, French, and other European carmakers. Electrical horsepower applies to motors and generators rated under electrical engineering standards.

KW to HP Conversion Formula

To convert kilowatts to horsepower, divide the kW value by the conversion factor (or multiply by its inverse):

• kW to Mechanical HP: HP = kW / 0.7457 (or kW x 1.3410)
• kW to Electrical HP: HP = kW / 0.746 (or kW x 1.3405)
• kW to Metric HP: HP = kW / 0.7355 (or kW x 1.3596)

Example: a 75 kW electric motor produces 75 / 0.7457 = 100.6 HP (mechanical). For a smaller motor, 1 kw to hp: 1 / 0.7457 = 1.341 HP.

Types of Horsepower Explained

Not all horsepower is the same. There are three main types in common use, each with a slightly different conversion factor. Using the wrong type can result in errors of 1 to 2 percent, which matters when sizing industrial motors or comparing engine specs across countries.

• Mechanical (Imperial) Horsepower: 1 HP = 0.7457 kW. The standard in the US and UK for car engines, motorcycles, outboard motors, power tools, and industrial machinery.
• Electrical Horsepower: 1 HP = 0.746 kW. Used by electrical engineers for motor and generator ratings. Defined as exactly 746 watts under electrical standards.
• Metric Horsepower (PS/CV/ch): 1 HP = 0.7355 kW. Standard in Germany (PS), France (CV), and Italy (cv). Slightly lower than imperial HP. A European car rated at 150 PS produces about 110.3 kW, not 111.9 kW as a 150 imperial HP engine would.

When comparing car specs from different countries, always verify which HP standard is being used. Most US, UK, and Japanese cars use mechanical HP. Most continental European cars use metric HP (PS).

10 HP to KW

Converting 10 HP to kW is one of the most common calculations for small engines, pumps, and compressors. Using mechanical horsepower:

10 HP x 0.7457 = 7.457 kW

For electrical horsepower: 10 HP x 0.746 = 7.46 kW. For metric horsepower: 10 HP x 0.7355 = 7.355 kW.

A 10 HP engine is typical for small riding lawnmowers, go-karts, light-duty water pumps, and small air compressors. In industrial motor catalogs, the nearest IEC standard size is 7.5 kW.

10 KW to HP

Converting 10 kW to HP is useful when evaluating electric motors, generators, and EV drivetrains. Using the mechanical horsepower standard:

10 kW / 0.7457 = 13.41 HP

A 10 kW motor appears in industrial fans, conveyor belts, small air compressors, and workshop equipment. In electric vehicle terminology, 10 kW represents a modest output suitable for urban electric scooters or low-speed electric vehicles.

100 HP to KW

100 HP is a widely recognized benchmark for mid-range car engines. Converting to kilowatts using mechanical HP:

100 HP x 0.7457 = 74.57 kW

A 100 HP petrol engine is standard in compact sedans and light crossovers. When comparing combustion engines to electric vehicles, 75 kW is the commonly accepted equivalent of 100 HP. This makes the 100hp kw equivalence of 74.57 kW one of the most practical automotive comparisons. The 100hp kw equivalence of 74.57 kW is a standard reference point when cross-comparing North American and European vehicle specifications.

100 KW to HP

100 kW is a common power rating for mid-range electric vehicles and industrial motors. Converting to horsepower:

100 kW / 0.7457 = 134.1 HP

To express 100kw in hp terms: 100 kW / 0.7457 = 134.1 HP. In EV terms, a 100 kW motor delivers performance comparable to a 134 HP combustion engine. Many urban electric vehicles, including entry-level models from mainstream manufacturers, are rated near 100 kW. For industrial motors, 100 kW sits at the upper end of standard IEC motor frames.

150 KW to HP

150 kW is a power level seen in performance electric vehicles and heavy industrial motors. Converting to horsepower:

150 kW / 0.7457 = 201.2 HP

A 150 kW motor delivers roughly 201 HP, placing it in the performance car category. Mid-range electric vehicles such as entry-level versions of popular EV models often operate near this power level. In industrial settings, a 150 kW motor is used for large pumps, compressors, and heavy conveyor systems.

15 KW to HP

15 kW is one of the most common sizes for industrial electric motors and commercial equipment. Converting to horsepower:

15 kW / 0.7457 = 20.12 HP

A 15 kW (approximately 20 HP) motor is standard for medium-size water pumps, milling machines, industrial air compressors, and HVAC fans. When US spec sheets list 20 HP and European ones list 15 kW for the same machine, they are referring to the same power output. This is one of the most useful kw to hp conversions for engineers working across international standards. Other common IEC motor sizes in this range: 11 kw in hp = 14.75 HP, and 18.5 kw to hp = 24.81 HP.

1.5 KW to HP

The 1.5 kW motor size is among the most widely produced in small industrial and household applications. Converting to horsepower:

1.5 kW / 0.7457 = 2.01 HP

A 1.5 kW motor (approximately 2 HP) powers small water pumps, bench grinders, drill presses, workshop lathes, and portable air compressors. A product listed as 1.5 kW and another listed as 2 HP are delivering essentially the same power output. The 1.5 kw in hp conversion is one of the most frequently searched power lookups for workshop owners comparing European and North American equipment specs. For the reverse direction, 1.5 hp in kw: 1.5 HP x 0.7457 = 1.12 kW.

1500 Watts to HP

1500 watts equals 1.5 kW. Converting 1500w to hp:

1500 W / 745.7 = 2.01 HP

Appliances rated at 1,500 watts include electric kettles, toasters, small space heaters, and some power drills. In mechanical terms, 1,500 W is just over 2 HP. For appliance comparison purposes, 1.5 kW = 2 HP is a practical rule of thumb.

HP to KW Conversion Table

Quick reference table for mechanical horsepower to kilowatts:

KW to HP Conversion Table

Quick reference table for kilowatts to mechanical horsepower:

Real-World Applications of HP and KW

Understanding when to use HP vs kW is essential across several industries. The IEC defines 26 standard motor power rating sizes from 0.12 kW to 1,000 kW, used in over 100 countries worldwide.

• Automotive: US and UK car engines carry HP ratings. European manufacturers use kW or metric HP (PS). A 150 kW car equals roughly 201 HP in imperial terms. A North American muscle car at 450 HP and a European sports car at 330 kW are close in output. At that level, 330 kW converts to 442 HP.
• Electric Vehicles: EV manufacturers universally specify motor output in kW. A Tesla Model Y Long Range outputs approximately 258 kW (346 HP). Converting EV kilowatts to horsepower helps drivers accustomed to HP-rated combustion engine cars understand performance expectations.
• Industrial Motors: IEC-standard electric motor power rating sizes come in fixed kW steps. Common values include 0.75, 1.5, 2.2, 4, 7.5, 11, 15, 22, 37, 55, 75, 110, 160, and 200 kW. US NEMA motors use HP equivalents for the same sizes.
• Marine Engines: Outboard motors and inboard engines for boats in North America carry HP ratings. A 150 HP outboard equals 111.9 kW, relevant when ordering European-spec replacement parts or comparing international boat listings.
• Generators: Industrial generators are rated in kVA and kW. A 100 kW generator delivers approximately 134 HP of mechanical output. Generator sizing guides often list both units to serve engineers working in different regional standards.
• Power Tools and Appliances: Appliances sold in Europe list power in watts or kW. North American equivalents list HP. A 2 HP workshop table saw equals 1.49 kW, which is a standard motor size for IEC-rated tools.

Horsepower vs Kilowatts: What Is the Difference?

Both horsepower and kilowatts measure the same physical quantity: power, which is the rate of doing work or transferring energy over time. The difference is purely one of unit systems and historical convention.

The kilowatt is part of the International System of Units (SI). One kilowatt equals 1,000 watts, where one watt is defined as one joule per second. To answer directly: how many kilowatts in a horsepower? One mechanical HP = 0.7457 kW, one electrical HP = 0.746 kW, and one metric HP = 0.7355 kW. The kilowatt is maintained by standards bodies including NIST (National Institute of Standards and Technology), which defines SI measurement standards used worldwide.

Engineer James Watt defined horsepower in the 18th century to market steam engines by comparing their output to draft horses. He estimated that one horse could do 33,000 foot-pounds of work per minute. This became the mechanical horsepower standard, later fixed at exactly 550 foot-pounds per second (approximately 745.7 watts).

Today, kilowatts are preferred in science, engineering, and international commerce. Horsepower persists in everyday consumer contexts in the US, UK, and a few other markets. Neither unit is more accurate. They are simply two ways to express the same physical quantity.

Limitations of This Calculator

This HP to kW converter is accurate for standard mechanical and electrical power conversions. Keep these limitations in mind for specialized use cases:

• HP type selection matters: The default conversion uses mechanical horsepower (0.7457 kW per HP). European car specs in PS/CV use metric HP (0.7355 kW per HP). Always verify which type is being stated before comparing.
• Rated vs. peak power: Engine and motor HP/kW ratings are peak or maximum values under ideal conditions. Actual working output is typically 80 to 90% of the rated figure.
• Efficiency losses not included: This calculator measures shaft power only. Electrical transmission losses, heat losses in combustion engines, and drivetrain friction are not factored into the conversion result.
• Boiler horsepower is different: Boiler HP, used in steam engineering, equals approximately 9.81 kW per HP. This is a completely separate unit and is not covered by the standard HP to kW conversion used here.
• kVA vs kW for generators: Generator capacity is often listed in kVA (kilovolt-amperes), not kW. To convert kVA to kW you need the power factor (typically 0.8). A 100 kVA generator at 0.8 power factor produces 80 kW, not 100 kW.

Large Power Conversion Reference

For industrial and utility-scale power comparisons: 1000kw to hp = 1,341 HP (large industrial motors and small power plants). 160kw to hp = 214.6 HP (performance EV and heavy commercial vehicle range).

Related Power Calculators

For complete power unit conversions, DigiCalc offers several related tools:

• KW to HP Converter: dedicated kilowatts to horsepower converter with full precision
• Kilowatts to Watts Converter: convert kW to watts for appliances and small motors
• Power Unit Converter: convert between HP, kW, watts, BTU/hr, and all power units in one tool