--- title: "Power Conversion Guide: Watts, Kilowatts & Horsepower | ShoutingNow" description: Overview of power conversion for watts, kilowatts, and horsepower with formulas, reference tables, and links. hp↔kW deep dive lives on the dedicated blog. url: "https://shoutingnow.com/guides/unit-conversion-guide/power-conversion/" image: "https://shoutingnow.com/wp-content/uploads/2026/07/Power-Conversion-Guide-Watts-Kilowatts-Horsepower-1024x683.webp" --- # Power Conversion Guide: Watts, Kilowatts & Horsepower **Power conversion** is how you compare motors, heaters, and generators when one label shows watts and another shows horsepower or kilowatts. Power is energy per time, the rate at which work is done or electricity is delivered, so the same machine can be described in W, kW, or hp without changing its output. This guide is the category overview: formulas, a reference table (including hp↔kW), and tool links. For the full automotive and appliance walkthrough of horsepower and kilowatts, use the dedicated [horsepower to kilowatts](https://shoutingnow.com/blog/horsepower-to-kilowatts/) article. On this page 12 1. 1 What power conversion covers 2. 2 Plain-language power formulas 3. 3 Horsepower ↔ kilowatts reference table 4. 4 Watts to kilowatts (everyday loads) 5. 5 Worked examples Example 1, space heater nameplate 6. Example 2, small motor in horsepower 7. Example 3, generator listing in kW [ 6 Common power conversion mistakes ](#common-power-conversion-mistakes) [ 7 Power converter tools ](#power-converter-tools) [ 8 Related reading ](#related-reading) [ 9 Frequently asked questions ](#sn-section-faqs) Show 4 more sections **Convert power now:** [Open the free Power Converter](https://shoutingnow.com/tools/power-converter/), watts, kilowatts, horsepower, and related units. No sign-up required. ## What power conversion covers Power measures how fast energy is used or produced. One watt equals one joule per second. Kilowatts suit household and industrial loads; horsepower remains common on engines and some motor nameplates. Converting power keeps those nameplates comparable when you size breakers, compare generators, or read mixed datasheets. Energy (kWh, joules) is a total over time. If you need totals rather than rates, use the [energy conversion guide](https://shoutingnow.com/guides/unit-conversion-guide/energy-conversion/) instead. ## Plain-language power formulas - Watts ↔ kilowatts: divide W by 1,000 for kW. Multiply kW by 1,000 for W. - Mechanical horsepower ↔ watts: 1 hp (mechanical) ≈ 745.7 W ≈ 0.7457 kW. - Metric horsepower ↔ watts: 1 metric hp ≈ 735.5 W, slightly less than mechanical hp. - Kilowatts ↔ mechanical horsepower: multiply kW by ≈ 1.341 for hp (or divide hp by 1.341 for kW). Always match the horsepower convention on the nameplate (mechanical vs metric) before you trust a one-line factor. ## Horsepower ↔ kilowatts reference table Quick lookup for mechanical horsepower. For worked vehicle and appliance examples, see [horsepower to kilowatts](https://shoutingnow.com/blog/horsepower-to-kilowatts/). hp (mech.) kW (approx.) W (approx.) 0.5 0.373 373 1 0.746 746 5 3.728 3,728 10 7.457 7,457 50 37.285 37,285 100 74.570 74,570 ## Watts to kilowatts (everyday loads) W kW 100 0.10 500 0.50 1,500 1.50 3,000 3.00 7,500 7.50 ## Worked examples ### Example 1, space heater nameplate A heater is rated **1,500 W**. In kilowatts: 1,500 ÷ 1,000 = **1.5 kW**. That is the rate; overnight energy use still depends on hours run (kW × hours = kWh). ### Example 2, small motor in horsepower A pump motor is labeled **2 hp** (mechanical). In kilowatts: 2 × 0.7457 ≈ **1.49 kW**. Confirm whether the label means mechanical or metric hp before ordering a replacement. ### Example 3, generator listing in kW A portable generator advertises **3.5 kW** continuous. In mechanical horsepower: 3.5 × 1.341 ≈ **4.69 hp**. Use continuous rating for load planning, not peak surge. ## Common power conversion mistakes - Confusing kW with kWh. Kilowatts are power; kilowatt-hours are energy. - Ignoring mechanical vs metric horsepower. The factors differ (~745.7 W vs ~735.5 W). - Comparing peak and continuous ratings. Convert the same rating type on both machines. ## Power converter tools Use the multi-unit [Power Converter](https://shoutingnow.com/tools/power-converter/) for watts, kilowatts, horsepower, and related pairs: - Power Converter ## Related reading - Horsepower to kilowatts, deep dive for hp↔kW use cases and examples - Engineering unit conversion reference, bridges force, power, and pressure - Unit conversion chart & calculator guide, full category map ## Frequently Asked Questions ### How do I convert watts to kilowatts? Divide watts by 1,000, so a 1,500 W heater comes out to 1.5 kW. The [Power Converter](https://shoutingnow.com/tools/power-converter/) covers horsepower and other pairs too if you need them. ### What is the quick factor from mechanical horsepower to kilowatts? One mechanical horsepower comes to about 0.7457 kW, or roughly 745.7 W. This guide keeps a reference table handy, but the [horsepower to kilowatts](https://shoutingnow.com/blog/horsepower-to-kilowatts/) article goes deeper into the walkthrough. ### Is metric horsepower the same as mechanical horsepower? Not quite. Metric horsepower sits around 735.5 W while mechanical horsepower is closer to 745.7 W, so check which convention the motor or engine nameplate is using. ### What is the difference between kilowatts and kilowatt-hours? Kilowatts measure a rate of power; kilowatt-hours measure energy, which is that power multiplied by time. Run a 2 kW load for 3 hours and you have used 6 kWh. ### When should I use the Power Converter vs the horsepower article? This guide and the [Power Converter](https://shoutingnow.com/tools/power-converter/) cover the category overview and any power pair you need. Head to [horsepower to kilowatts](https://shoutingnow.com/blog/horsepower-to-kilowatts/) instead if you want the fuller hp to kW narrative with examples. ### Are ShoutingNow power converters free? They are, the Power Converter runs free in your browser with no account required. ```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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