Free online power converter. Convert between watts, kilowatts, horsepower, BTU/hr, and foot-pounds per second instantly.
Our free Power Converter quickly and accurately converts between all major power units — watts, kilowatts, megawatts, horsepower, BTU per hour, and foot-pounds per second. Whether you're comparing engine specifications, sizing electrical equipment, or working on engineering calculations, this converter makes it effortless.
Power measures the rate at which energy is transferred or converted. The SI unit is the watt, but automotive and mechanical engineering commonly use horsepower, while HVAC systems use BTU per hour. This converter bridges all these measurement systems.
Enter your value, select units, and get an instant, precise result. No formulas to look up, no manual math needed.
Tracking this metric consistently enables professionals to identify patterns in how they allocate time and effort, revealing opportunities to work more effectively and accomplish more each day. This measurement provides a critical foundation for goal setting and progress tracking, helping you align daily activities with longer-term objectives and meaningful milestones.
Precise quantification supports meaningful goal-setting and accountability, ensuring that improvement efforts are focused on areas with the greatest potential impact on output. Having accurate figures readily available simplifies project planning, deadline negotiation, and workload balancing conversations with managers, clients, and team members. Data-driven tracking enables proactive schedule management, helping professionals protect focused work time and reduce the cognitive overhead of constant task-switching throughout the day.
Converted Value = Input × (From Unit in Watts) ÷ (To Unit in Watts) Key: 1 hp = 745.7 W, 1 kW = 1,000 W, 1 BTU/hr = 0.29307 W.
Result: 186.425 kW
250 hp × 745.7 W/hp = 186,425 W. Then 186,425 W ÷ 1,000 W/kW = 186.425 kW. This shows that a 250-horsepower engine produces about 186 kilowatts of power.
Power is the rate at which energy is used, produced, or transferred. Different industries use different units, making conversion essential for comparison and engineering calculations.
The debate between horsepower and kilowatts is largely regional. North America favors horsepower for automotive applications, while Europe and most of the world use kilowatts. Both measure the same thing — the rate of doing work.
Power conversions are crucial for comparing vehicle engines, sizing generators and solar systems, evaluating HVAC equipment, and understanding electrical loads. This converter simplifies all these tasks into a single, easy-to-use tool.
One mechanical horsepower equals approximately 745.7 watts. This is the standard conversion used in automotive and mechanical engineering. Electric horsepower is slightly different at exactly 746 watts.
One kilowatt equals 1,000 watts. Kilowatts are simply a more convenient unit for larger power values. Your home electricity usage is measured in kilowatt-hours, which combines power (kW) with time.
Multiply the BTU/hr value by 0.29307 to get watts. For example, 10,000 BTU/hr × 0.29307 = 2,930.7 watts or about 2.93 kW.
A watt is the SI unit of power, defined as one joule per second. It measures the rate of energy transfer. Named after James Watt, it is used universally for electrical, mechanical, and thermal power measurements.
Horsepower has been used in automotive engineering since the early days of the automobile. It originated from James Watt's comparison of steam engines to draft horses. While many countries now use kW in official specifications, horsepower remains popular in marketing and everyday use.
A typical US household uses about 1,200 watts on average (about 30 kWh per day). Peak usage can exceed 5,000–10,000 watts when major appliances like air conditioning, dryers, and ovens run simultaneously.