Hydraulic motor power calculation formulas

Hydraulic Motor Power Calculation Formulas


In the world of hydraulic systems, the power calculation for hydraulic motors plays a crucial role in determining the efficiency and performance of the system. Understanding the formulas involved in calculating the power requirements is essential for engineers and designers to optimize their hydraulic systems. In this article, we will explore the key formulas used for hydraulic motor power calculations and their significance in the field.

1. Displacement Calculation

To determine the displacement of a hydraulic motor, you can use the following formula:

Displacement (in cubic inches per revolution) = (Motor Speed in RPM) / (Motor Displacement per Revolution)

This formula helps in understanding the volume of fluid that the motor can displace in one revolution. It is a critical factor in determining the motor’s power output and overall system performance.

2. Input Power Calculation

The input power to a hydraulic motor can be calculated using the following formula:

Input Power (in horsepower) = (Motor Torque in lb-ft) * (Motor Speed in RPM) / 5252

This formula takes into account both the torque applied to the motor and the rotational speed to determine the input power required. It provides valuable insights into the energy consumption of the hydraulic system.

3. Efficiency Calculation

The efficiency of a hydraulic motor can be calculated using the following formula:

Efficiency (in percentage) = (Output Power / Input Power) * 100

This formula helps in quantifying the effectiveness of the motor in converting input power into useful output power. Understanding the efficiency allows engineers to optimize the system and minimize energy losses.

4. Product Q&A

Q: What are the key factors affecting hydraulic motor power calculation?

A: The key factors include motor displacement, rotational speed, torque, and system efficiency. These factors directly impact the power requirements and overall performance of the hydraulic motor.

Q: How can I optimize the power efficiency of a hydraulic motor?

A: To optimize power efficiency, you can focus on reducing system losses, using efficient components, selecting the right motor size, and properly maintaining the hydraulic system.

Q: Can you provide any practical tips for accurate power calculation?

A: Yes, it is crucial to gather accurate data on motor specifications, such as displacement and speed, and consider real-world operating conditions. Additionally, utilizing advanced software tools and consulting with experts can enhance the accuracy of power calculations.


Hydraulic motor power calculation is a fundamental aspect of designing efficient and high-performance hydraulic systems. By leveraging the formulas mentioned above and considering various factors, engineers can accurately determine the power requirements and optimize their systems accordingly. Our company, a leader in the Chinese motor market, specializes in Hydraulic Motors, Bauer gear motor, hydraulic piston, servo motors, brake motors, driveline motors, etc. With a production capacity of 200,000 sets and state-of-the-art manufacturing equipment, we offer top-quality products, competitive prices, and impeccable service. We welcome customers to reach out for customizations based on drawings and samples.