Converting horsepower to kilowatts is essential when translating engine and motor specifications from imperial to metric power units. Whether you are importing a vehicle, comparing industrial equipment ratings, or working on an engineering project that requires SI units, this hp-to-kW converter returns the metric value immediately in the browser.
This page is tied to the shared power calculator, which currently supports only six units: watts, kilowatts, megawatts, mechanical horsepower, BTU per hour, and foot-pounds per second. The default pair on this route is horsepower to kilowatts. The interface does not provide separate selectors for metric horsepower, PS, CV, electrical horsepower, or boiler horsepower, so all page promises stay aligned to the mechanical-horsepower constant the component actually uses.
On this route, horsepower means the shared component's mechanical horsepower value of 745.7 watts. That means the page converts 1 hp to 0.7457 kilowatts and keeps its examples aligned with the value the tool actually returns.
To convert any power value from horsepower to kilowatts, use the following equation:
kW = HP x 0.7457
This is the complete formula for the calculator on this page. You multiply the horsepower value by 0.7457 to obtain the kilowatt equivalent. For example, 200 HP multiplied by 0.7457 equals 149.14 kW. That matches the shared power component because it uses 745.7 watts per mechanical horsepower.
Follow these steps to convert any horsepower value to kilowatts manually:
Step 1: Take your power in horsepower. For example, let us convert 350 HP to kilowatts.
Step 2: Multiply the horsepower value by 0.7457. So 350 x 0.7457 = 260.995.
Step 3: The answer is 260.995 kW, which rounds to about 261.0 kW.
Let us try another example. Convert 500 HP to kilowatts:
Step 1: Start with 500 HP.
Step 2: Multiply by 0.7457: 500 x 0.7457 = 372.85.
Step 3: The result is 372.85 kW.
For small values, the same formula applies. Converting 10 HP gives 7.457 kW.
Mechanical horsepower is historically tied to 550 foot-pounds per second. The shared component behind this route uses 745.7 watts for that horsepower value, which yields 0.7457 kilowatts per horsepower. That is the standard this page follows. It does not switch among regional horsepower variants, so the copy stays focused on the same mechanical-horsepower assumption used in the UI.
Horsepower is one of the oldest units of power still in widespread use. James Watt popularized the term to compare steam-engine output with the work capacity of draft horses. Despite its age, horsepower remains deeply embedded in automotive marketing and in many industrial equipment catalogs.
The kilowatt is the modern SI unit of power, equal to 1000 joules per second. It integrates directly with the metric system and is standard in engineering, electrical systems, and international trade. Converting horsepower to kilowatts is especially common when a source market uses HP but the destination market, regulator, or engineering document expects kW.
Converting horsepower to kilowatts is particularly important when registering imported vehicles, comparing industrial motor specifications, or standardizing equipment sheets. For the reverse conversion, our kW to HP converter translates metric power values back to the same mechanical-horsepower standard. If you need the broader six-unit selector, use the shared power converter tool. For thermal rate comparisons, the BTU/h to watts converter covers the BTU/h route available in the same component.
Converting horsepower to kilowatts is necessary across many industries and everyday situations:
Vehicle Registration and Taxation: Many countries record vehicle output in kilowatts. A car rated at 300 HP converts to 223.71 kW on this route, which is the form many registration systems require.
Industrial Equipment Procurement: When motors, pumps, and compressors are sourced internationally, one supplier may quote horsepower while another lists kilowatts. Converting to a common unit prevents mismatched comparisons.
Renewable Energy Systems: Backup generators are often described in horsepower even when solar systems, batteries, and inverters are described in kilowatts. A shared numeric basis makes these systems easier to compare.
Motorsport and Performance Reporting: Racing series, tuner shops, and enthusiast forums often switch between horsepower and kilowatts depending on the audience. Accurate conversion helps keep reporting consistent.
What this page does not do is estimate drivetrain loss, torque, RPM, fuel use, or motor efficiency. It converts a numeric mechanical-horsepower figure into kilowatts using the same shared constant as the component.
Here are some useful tricks for working with HP-to-kW conversions:
Multiply by 0.75 for a Fast Estimate: Using three-quarters gets close to the tool result in your head. For example, 200 HP x 0.75 = 150 kW, while the route returns 149.14 kW.
Remember the 100 HP Benchmark: A clean anchor point is 100 HP = 74.57 kW. Once you know that, 200 HP is about 149.14 kW and 300 HP is about 223.71 kW.
Expect the kW Number to Be Smaller: Because this route uses 0.7457 kW per hp, the kilowatt result should be lower than the horsepower input. If it is larger, you probably reversed the conversion direction.
Verify the Horsepower Standard: If your source spec says PS, CV, electrical horsepower, or boiler horsepower, do not assume this page will reinterpret it. The tool expects mechanical horsepower only.
For a broader overview of the same shared component, visit our shared power converter tool, which supports watts, kilowatts, megawatts, mechanical horsepower, BTU/h, and foot-pounds per second.
| Horsepower (HP) | Kilowatts (kW) |
|---|---|
| 1 | 0.746 |
| 5 | 3.729 |
| 10 | 7.457 |
| 25 | 18.643 |
| 50 | 37.285 |
| 75 | 55.928 |
| 100 | 74.570 |
| 150 | 111.855 |
| 200 | 149.140 |
| 250 | 186.425 |
| 300 | 223.710 |
| 400 | 298.280 |
| 500 | 372.850 |
| 1000 | 745.700 |
On this route, the formula is kW = HP x 0.7457. You multiply the horsepower value by 0.7457 because the shared power component uses 745.7 watts for each mechanical horsepower. For example, 250 HP converts to 186.425 kW.
In this calculator, 1 horsepower equals 0.7457 kilowatts, or 745.7 watts, because that is the mechanical-horsepower constant used by the shared component. This page does not offer a selector for PS, CV, electrical horsepower, or boiler horsepower.
One hundred horsepower equals 74.57 kilowatts on this page. That is calculated directly from 100 x 0.7457.
James Watt used horsepower as a way to communicate engine output in terms people already understood. That historical framing is why the unit still survives in automotive and machinery contexts even though kilowatts are now the SI standard.
Yes. Mechanical horsepower, metric horsepower (PS or CV), electrical horsepower, and boiler horsepower are different standards. This page does not switch among them. It uses the shared component's mechanical-horsepower constant only, so source figures labeled in other variants should be normalized before you use this route.
If the BHP figure is already expressed in mechanical horsepower, you can use the same formula: kW = BHP x 0.7457. What this route does not do is model drivetrain loss, dyno methodology, or alternate horsepower standards. It simply converts the numeric mechanical-horsepower value exposed by the shared power component.
Choose this page when the source power value is already in horsepower and the destination needs kilowatts. That is common for engine specs, motor ratings, industrial equipment, and international product comparisons where an imperial-style power figure has to become SI-friendly.
If the task is actually about total energy consumption, use the energy tools instead. This route is strongest when the practical question is specifically hp-to-kW.
Review which horsepower standard the source assumes and how the destination wants the value rounded. For the reverse calculation, use kW to Horsepower Converter. If the next scale is smaller electrical power, continue to Watts to kW Converter instead of chaining estimates manually.
That keeps the page practical and honest. It handles one power-unit translation and leaves broader measurement-context choices visible.
Convert horsepower to kilowatts instantly.