--- title: "Horsepower to Kilowatts: Complete Power Conversion Guide | ShoutingNow" description: Learn how to convert horsepower to kilowatts, understand engine and EV motor power ratings, compare HP vs kW, and avoid common conversion mistakes. url: "https://shoutingnow.com/blog/horsepower-to-kilowatts/" image: "https://shoutingnow.com/wp-content/uploads/2026/07/Horsepower-to-kilowatts-conversion-guide-1024x683.webp" --- # Horsepower to Kilowatts: Complete Power Conversion Guide Shop for a car and you get horsepower. Shop for an EV, an electric motor, or industrial machinery and the spec sheet switches to kilowatts, sometimes on the very same page. On this page 13 1. 1 What is horsepower? 2. 2 What is a kilowatt? 3. 3 Horsepower vs kilowatts 4. 4 Common conversions 5. 5 Where these units are used Horsepower 6. Kilowatts [ 6 EV motor power ratings ](#ev-motor-power-ratings) [ 7 Common conversion mistakes ](#common-conversion-mistakes) [ 8 Tips for accurate power conversion ](#tips-for-accurate-power-conversion) [ 9 One last note ](#one-last-note) [ 10 Related reading ](#related-reading) [ 11 Frequently asked questions ](#sn-section-faqs) Show 6 more sections Understanding the relationship between these units helps when comparing vehicle performance, buying equipment, reading specifications, or converting engine power. The [power conversion guide](https://shoutingnow.com/guides/unit-conversion-guide/power-conversion/) owns the category overview and reference table. This article owns the **horsepower to kilowatts** deep dive: which horsepower definition you are holding, how to convert accurately, and how to read vehicle and appliance claims without mixing peak and continuous ratings. ## What is horsepower? Horsepower (HP) is a unit of power originally developed by engineer James Watt to compare steam engines with draft horses. Today, horsepower is commonly used for cars, motorcycles, boats, lawn equipment, industrial engines, pumps, and compressors. ## What is a kilowatt? A kilowatt (kW) is a metric unit of power equal to **1,000 watts**. Kilowatts are commonly used for electric vehicles (EVs), electric motors, home appliances, solar energy systems, industrial machinery, and power generation. ## Horsepower vs kilowatts Feature Horsepower (HP) Kilowatt (kW) Measurement system Imperial Metric (SI) Common use Engines Electric power Scientific standard Less common International standard ## Common conversions Horsepower Kilowatts 1 HP 0.746 kW 5 HP 3.73 kW 10 HP 7.46 kW 50 HP 37.3 kW 100 HP 74.6 kW 200 HP 149.2 kW Kilowatts Horsepower 1 kW 1.341 HP 5 kW 6.71 HP 10 kW 13.41 HP 50 kW 67.05 HP 100 kW 134.1 HP Mechanical (imperial) horsepower is about **745.7 W**, or **0.7457 kW** per hp. Metric horsepower (PS) is slightly smaller at about **735.5 W**. Run live nameplates in the [Power Converter](https://shoutingnow.com/tools/power-converter/). ## Where these units are used ### Horsepower Horsepower remains popular for automotive engines, agricultural equipment, marine engines, and small machinery. ### Kilowatts Kilowatts are widely used for electric vehicles, industrial motors, renewable energy, electrical engineering, and household electricity. ## EV motor power ratings Most electric vehicles list motor output in kilowatts. For easier comparison with gasoline vehicles, manufacturers often mention the equivalent horsepower value as well. Example: **150 kW ≈ 201 HP**. That is a power rating, not fuel energy; for kWh and joules see the [energy conversion guide](https://shoutingnow.com/guides/unit-conversion-guide/energy-conversion/). ## Common conversion mistakes - Confusing mechanical and metric horsepower, different horsepower standards exist, so always verify which type is used. - Mixing power and energy, kilowatts measure power, while kilowatt-hours (kWh) measure energy. - Rounding too early, keep full precision until the final result. - Using approximate values, for engineering calculations, use precise conversion factors. ## Tips for accurate power conversion - Use a trusted HP to kW calculator. - Verify the horsepower standard. - Check manufacturer specifications. - Use consistent units throughout calculations. ## One last note The 0.746 conversion factor is the one to remember, and the one thing worth double-checking is which horsepower standard you started with. Get that part right and comparing a gas engine to an electric motor stops being a guessing game. ## Related reading - Power conversion guide, watts, kilowatts, horsepower overview - Engineering unit conversion reference, force, power, pressure bridge - Metric vs imperial · Common unit conversion mistakes · Construction measurement tips - Unit conversion chart & calculator guide, cluster map ## Frequently Asked Questions ### Is horsepower larger than a kilowatt? No, it is the smaller unit. One horsepower comes out to about 0.746 kilowatts. The [Power Converter](https://shoutingnow.com/tools/power-converter/) will run any pair you need on the fly. ### Why do EVs use kilowatts? Because kilowatts are the SI unit of power, and that fits naturally with the electrical systems already running EV motors and chargers. ### Can I compare HP and kW directly? You can, since they describe the same physical quantity in different units. Just make sure you know which horsepower definition your source is using before you compare numbers. ### What is the difference between kW and kWh? kW measures power at an instant; kWh measures energy used over time. They look similar but are not interchangeable, so keep them straight. ### Which unit is more commonly used worldwide? Kilowatts are the global default, though horsepower has stuck around stubbornly for describing vehicle engines. The [power conversion guide](https://shoutingnow.com/guides/unit-conversion-guide/power-conversion/) has the wider category overview. ### Is metric horsepower the same as mechanical horsepower? They are close but not quite equal. Metric horsepower (PS) works out to about 735.5 W, while mechanical horsepower lands closer to 746 W. ```json [{"@context":"https://schema.org","@type":"Organization","name":"ShoutingNow","url":"https://shoutingnow.com/","logo":{"@type":"ImageObject","url":"https://shoutingnow.com/wp-content/themes/shoutingnow-theme/assets/images/logo.png"},"sameAs":["https://x.com/makani20","https://www.linkedin.com/in/makani20/","https://post-see.com"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","email":"support@shoutingnow.com","url":"https://shoutingnow.com/contact/"},"slogan":"Learn. Build. 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