| Multiplier | Converted Value |
|---|
Converting between power units is essential in electrical engineering, automotive applications, industrial machinery, and energy systems. Whether you need to convert Watts to Horsepower, Kilowatts to BTU/hr, or work with any other power measurement, understanding power conversion ensures accuracy in your calculations and technical applications.
Our Power Converter provides instant, precise results for all major power units including Watts (W), Kilowatts (kW), Horsepower (HP), BTU per hour (BTU/hr), and more. This tool is completely free, works on all devices, and requires no registration or downloads.
| Watts (W) | Kilowatts (kW) | Horsepower (HP) | BTU/hr | Common Application |
|---|---|---|---|---|
| 1 | 0.001 | 0.00134 | 3.412 | LED light bulb |
| 100 | 0.1 | 0.134 | 341.2 | Bright light bulb |
| 750 | 0.75 | 1.006 | 2,559 | Microwave oven |
| 1,000 | 1.0 | 1.341 | 3,412 | Hair dryer |
| 1,500 | 1.5 | 2.011 | 5,118 | Space heater |
| 2,000 | 2.0 | 2.682 | 6,824 | Electric kettle |
| 5,000 | 5.0 | 6.705 | 17,060 | Window AC unit |
| 7,500 | 7.5 | 10.057 | 25,590 | Central AC unit |
| 10,000 | 10.0 | 13.410 | 34,120 | Electric car motor |
| 75,000 | 75.0 | 100.572 | 255,900 | Industrial motor |
| 100,000 | 100.0 | 134.102 | 341,200 | Large industrial equipment |
| 750,000 | 750.0 | 1,005.7 | 2,559,000 | Wind turbine |
200 HP engine = 149.1 kW
Car engine power ratings
1.5 kW heater = 5,118 BTU/hr
HVAC system specifications
50 HP motor = 37.3 kW
Manufacturing machinery
5 kW solar panel = 17,060 BTU/hr
Solar system capacity
The need to convert between power measurements arises frequently in various technical and industrial contexts. Different countries, industries, and applications use different power units, creating daily conversion needs for:
The Watt is the SI unit of power, named after Scottish inventor James Watt. It represents the rate of energy transfer of one joule per second. Watts are commonly used for electrical power ratings and energy consumption measurements.
The Horsepower is a unit of power originally defined by James Watt to compare the power of steam engines with draft horses. It's commonly used in automotive and mechanical applications to rate engine and motor power.
The BTU per hour measures the rate of heat energy transfer and is commonly used in HVAC systems to rate heating and cooling capacity. It represents how many British Thermal Units of energy are transferred in one hour.
| Unit | Watts (W) | Kilowatts (kW) | Horsepower (HP) | BTU/hr |
|---|---|---|---|---|
| 1 W | 1 | 0.001 | 0.00134 | 3.412 |
| 1 kW | 1,000 | 1 | 1.341 | 3,412 |
| 1 HP | 745.7 | 0.7457 | 1 | 2,545 |
| 1 BTU/hr | 0.293 | 0.000293 | 0.000393 | 1 |
| 1 Ton (cooling) | 3,517 | 3.517 | 4.717 | 12,000 |
| 1 MW | 1,000,000 | 1,000 | 1,341 | 3,412,000 |
| 1 Metric HP | 735.5 | 0.7355 | 0.986 | 2,510 |
Power measures the rate of energy transfer (Watts), while energy measures total consumption (Watt-hours). Don't confuse kW (power) with kWh (energy).
Mechanical horsepower (745.7 W) differs from metric horsepower (735.5 W). Always specify which standard you're using.
In AC electrical systems, apparent power (VA) differs from real power (W) due to power factor. Use appropriate values for your calculations.
Equipment may have different peak and continuous power ratings. Use the appropriate rating for your specific application.
Engine power ratings require conversion between horsepower and kilowatts for international specifications and performance comparisons.
Heating and cooling systems use BTU/hr ratings that must be converted to kW for electrical load calculations and energy efficiency analysis.
Motor specifications often require conversion between horsepower and kilowatts for equipment selection, electrical system design, and energy management.
1 mechanical horsepower equals exactly 745.699872 Watts. For most practical purposes, 745.7 W is sufficiently accurate. Note that metric horsepower equals 735.5 W.
Power is the rate of energy transfer (measured in Watts or HP), while energy is the total amount of work done over time (measured in Watt-hours or kWh). Power × Time = Energy.
HVAC systems traditionally use BTU/hr because it directly relates to thermal energy transfer. This makes it easier to understand heating and cooling capacity in terms of the amount of heat moved per hour.
Mechanical HP × 0.986 = Metric HP or Metric HP × 1.014 = Mechanical HP. Mechanical HP (745.7 W) is slightly larger than metric HP (735.5 W).
One ton of cooling equals 12,000 BTU/hr or 3.517 kW. This unit comes from the amount of cooling provided by melting one ton of ice in 24 hours. It's commonly used for air conditioning capacity.
Yes, our converter uses exact conversion factors. However, for electrical motors, also consider efficiency losses, power factor, and starting vs. running power requirements in your system design.
The Watt was named after James Watt, who also developed the concept of horsepower to market his steam engines. The BTU originated from British thermal studies in the 19th century. These units evolved from practical needs to measure and compare different types of power sources and energy systems.
Modern power measurements are precisely defined using international standards, ensuring accuracy across engineering applications, manufacturing specifications, and energy efficiency calculations worldwide.
Understanding power conversion is essential across engineering, automotive, industrial, and energy sectors. Whether you're specifying motor requirements, analyzing energy consumption, designing HVAC systems, or comparing equipment performance, accurate power conversion ensures proper system sizing and efficient operation.
Remember the key conversion factors: 1 HP = 745.7 W, 1 kW = 3,412 BTU/hr, and 1 Ton cooling = 12,000 BTU/hr. Use our free calculator above for instant, accurate results, and refer to our comprehensive tables for quick reference. With this guide, you'll confidently handle power conversions in any technical application.