Conversor de Potência
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
1 W = 0,001 kW = 1e-6 MW = 0,00134102 hp = 3,41214 BTU/h = 0,239006 cal/s
About this calculator
The Power Converter from UtilizAí is an online tool that converts power values between six different units: watt (W), kilowatt (kW), megawatt (MW), horsepower (hp), BTU/h and cal/s. Simply enter a value and select the source and target units to get the result instantly. The tool is useful for professionals and students working with energy systems, motors, HVAC and other areas involving power measurements.
The operation is straightforward: the tool uses fixed conversion factors based on the watt, the SI standard unit. For example, 1 watt equals 0.001 kW, 0.00134102 hp, 3.41214 BTU/h or 0.239006 cal/s. The calculator performs the conversion by multiplying or dividing the entered value by the appropriate factors, ensuring accuracy for technical and everyday calculations.
Use this calculator when you need to compare power ratings of electrical devices (such as water heaters and motors), specify heating or cooling systems, or convert data from technical manuals using different units. It is especially useful for engineers, electronics technicians, HVAC professionals and students of physics or engineering.
Important precautions: verify that the source unit is correct to avoid factor errors. Note that horsepower (hp) may have slightly different definitions (mechanical hp vs. metric hp); this tool uses mechanical hp (745.7 W). For conversions requiring high precision, consider rounding and the possibility of using more decimal places.
Frequently asked questions
How do I convert watts to horsepower?
Enter the value in watts, select watt as source and horsepower as target. The result will be displayed automatically.
What is the difference between mechanical hp and metric hp?
Mechanical hp equals 745.7 W, while metric hp equals 735.5 W. This tool uses mechanical hp, common in countries like the US and Brazil.
Can I convert BTU/h to watts?
Yes, select BTU/h as source and watt as target. The conversion factor is 1 BTU/h = 0.293071 W.
Does the calculator work for very large or small values?
Yes, it accepts decimals and scientific notation, but for extreme values there may be rounding. Use with caution.
I need to convert cal/s to kW. How do I do that?
Simply enter the value in cal/s, select cal/s as source and kW as target. The result will be given automatically.