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Accurately convert between watts, kilowatts, horsepower, and other power units. Ideal for engineering, physics, and everyday calculations.
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Dealing with a mix of power units across different countries, industries, or textbooks (such as watts, horsepower, or joules per second) can make calculations and comparisons difficult. This tool is designed to solve that problem by instantly converting your input value into the equivalent values of all other common power units. Power is the rate at which work is done or energy is consumed over time. Its base unit in the International System of Units (SI) is the watt (W), which equals 1 joule per second. Simply enter a value and select its original unit, and the tool will use precise conversion factors to output a complete set of results covering SI, Imperial, Metric, and other systems.
Q: How many kilowatts are in 1 horsepower?
1 mechanical horsepower (hp) is approximately equal to 0.7457 kilowatts (kW), while 1 metric horsepower (PS) is approximately equal to 0.7355 kilowatts (kW). This is the most common conversion needed when describing automotive and electric motor power.
Q: How do I control the decimal places of the results? Does it affect calculation accuracy?
It does not affect internal calculation accuracy. The tool uses a high-precision math library for internal calculations. The decimal places you select via the "Precision" dropdown menu only control the rounding format of the final displayed results for your convenience.
Please ensure your input is a valid number (positive, negative, zero, or decimal). This tool performs calculations entirely on the front end; your input data is never uploaded to a server, ensuring your privacy and security. The results are suitable for general calculations and reference. For scientific research or critical engineering designs requiring extremely high precision, we recommend verifying with professional software.
When converting power units, pay special attention to the difference between mechanical horsepower (hp) and metric horsepower (PS). They have different conversion factors, and confusing them is a common mistake. For example, when comparing car engine specs, American and British models often use mechanical horsepower (hp), while some older German or Japanese standards might use metric horsepower (PS). A typical conversion example: converting a motor rated at 100 kilowatts (kW) to other units yields approximately 134 mechanical horsepower (hp), 136 metric horsepower (PS), and 101,971.62 kilogram-meters per second (kg·m/s). Understanding the physical definitions behind these units (e.g., 1 metric horsepower is defined as a work rate of 75 kg·m/s) helps in using and verifying conversion results more accurately.
