Formula: Watts (W) = Horsepower (HP) × 746
Power measurement is essential in industries that use motors, electrical devices, and mechanical systems. Horsepower (HP) and watts (W) are two common power units, and converting between them helps compare equipment, assess efficiency, and optimize energy consumption.
This article explains the HP to watts conversion using a straightforward formula. You will also find practical examples and industry applications to help you calculate power accurately.
Table of Contents
What is Horsepower (HP)?
Horsepower (HP) is a unit of power used to measure the rate at which work is done. It was introduced by James Watt to compare steam engines to horse-driven power. One mechanical horsepower (HP) is equal to 746 watts (W).
There are different types of horsepower:
- Mechanical HP (Imperial HP) = 746 W
- Electrical HP = 746 W
- Metric HP (PS or CV) = 735.5 W
- Boiler HP = 9,810 W
For general calculations, 1 HP = 746 W is the standard formula.
What is a Watt (W)?
A watt (W) is the standard unit of power in the International System of Units (SI). It measures the rate of energy transfer. One watt equals one joule per second.
In electrical systems, wattage helps determine energy consumption and power output. For example, household appliances, industrial machines, and motors are rated in watts or kilowatts.
HP to Watts Conversion Formula
The formula for converting horsepower (HP) to watts (W) is: Watts (W)=Horsepower (HP)×746
Example Calculation:
If you have a 5 HP motor, the power in watts is: 5×746=3,730W
This means the motor consumes or produces 3,730 watts of power.
How to Convert HP to Watts Step by Step
- Identify the horsepower rating: Check the equipment’s power rating in HP.
- Use the conversion factor: Multiply the HP value by 746.
- Get the result in watts: The final number is the power output in watts.
Example 1: Convert 2 HP to Watts
2×746=1,492W
A 2 HP motor has a power rating of 1,492 watts.
Example 2: Convert 10 HP to Watts
10×746=7,460W
A 10 HP motor consumes 7,460 watts.
Watts to HP Conversion
To convert watts back to horsepower, use the formula: HP=Watts (W)746
Example: Convert 2,238 Watts to HP
2,238746=3 HP
A machine with 2,238 W has a power output of 3 HP.
Applications of HP to Watts Conversion
1. Industrial Machinery
Manufacturing equipment such as motors, compressors, and pumps are often rated in HP. Converting to watts helps in energy efficiency calculations.
2. Household Appliances
Home appliances, like air conditioners and washing machines, sometimes display power ratings in HP. Converting to watts helps in selecting compatible power supplies.
3. Automotive Industry
Car engines are rated in horsepower, but electric vehicles use watts or kilowatts. HP to watts conversion helps in comparing energy efficiency.
4. Renewable Energy Systems
Solar panels, wind turbines, and generators are rated in watts. Converting HP to watts allows users to match power consumption with energy output.
HP to Watts Conversion Table
| Horsepower (HP) | Watts (W) |
|---|---|
| 1 HP | 746 W |
| 2 HP | 1,492 W |
| 3 HP | 2,238 W |
| 5 HP | 3,730 W |
| 10 HP | 7,460 W |
| 15 HP | 11,190 W |
| 20 HP | 14,920 W |
| 50 HP | 37,300 W |
Common Questions About HP to Watts Conversion
1. Why is HP to Watts Conversion Important?
This conversion helps compare mechanical and electrical power ratings, ensuring proper equipment selection and energy efficiency.
2. How Do I Convert HP to kW?
1 kilowatt (kW) = 1,000 watts. Convert HP to watts, then divide by 1,000.kW=HP×7461000
Example:5×746=3,730 W=3.73 kW5
3. Do Electric Motors Have the Same HP to W Conversion?
Yes, most electric motors follow 1 HP = 746 W unless specified otherwise.
Conclusion
Converting HP to watts is useful for industries that work with motors, electrical devices, and mechanical power. The HP to W formula ensures accurate calculations for equipment selection and energy consumption.
Use the standard conversion 1 HP = 746 W to find power ratings in watts. Whether you are dealing with industrial machines, home appliances, or automotive engines, understanding this conversion helps in better energy management and efficiency.