Power Converter

What is a Power Converter?

A power converter is a practical tool designed to transform power measurements between different unit systems used globally in engineering, physics, automotive, and HVAC applications. The most common power units include watts (W), kilowatts (kW), megawatts (MW), horsepower (hp), British thermal units per hour (BTU/h), kilocalories per hour (kcal/h), and foot-pounds per second (ft-lb/s). Each unit serves specific purposes: watts are the SI base unit used globally in physics and engineering, kilowatts and megawatts are used for larger power levels in electricity and industry, horsepower is used for engines and motors especially in the US, BTU per hour is used for heating and cooling systems, kilocalories per hour is used in some engineering contexts, and foot-pounds per second is used in mechanical power calculations.

Understanding power conversions is crucial when comparing the output of machines, sizing electrical systems, evaluating engine performance, or choosing appliances. Power is expressed in different units depending on the industry and region, and converting between them makes equipment comparable. Electrical engineers work in watts and kilowatts, mechanics in mechanical horsepower, heating and cooling specialists in BTU per hour, and physicists in foot-pounds per second. The conversion factors between these units follow directly from their definitions: one mechanical horsepower is about 745.7 watts, one kilowatt equals roughly 3412 BTU per hour, and one watt corresponds to about 0.7376 foot-pounds per second.

This converter runs entirely inside your browser using plain JavaScript, with no external libraries, no network requests, and no data collection of any kind. Enter a power value, choose the starting unit and the unit you want as output, and the converted result updates the moment you type. A swap button reverses the direction of the conversion, and the finished result can be copied to the clipboard for reuse in documents, spreadsheets, or other applications. All seven supported power units share one internally consistent factor table, so every calculation is computed directly from the base unit rather than rounded through intermediate steps, which keeps the output accurate and dependable for repeated professional or everyday use.

How to use this Power Converter

• Enter the power value you want to convert in the Value field.
• Select the unit you are converting from using the From Unit dropdown.
• Select the unit you want to convert to using the To Unit dropdown.
• Click Swap to quickly exchange the from and to units.
• Click the result to copy the converted value to your clipboard.