Enter the motor pressure (PSI) and the motor torque (in-lbs) into the Hydraulic Motor Displacement Calculator. The calculator will evaluate the Hydraulic Motor Displacement. 

Hydraulic Motor Displacement Formula

The following two example problems outline the steps and information needed to calculate the Hydraulic Motor Displacement.

HMD = T * 2*pi  / P


  • HMD is the Hydraulic Motor Displacement (in^3)
  • P is the motor pressure (PSI) 
  • T is the motor torque (in-lbs) 

To calculate the hydraulic motor displacmenet, multiply the motor torque by 2 times pi, then divide by the motor pressure.

How to Calculate Hydraulic Motor Displacement?

The following steps outline how to calculate the Hydraulic Motor Displacement.

  1. First, determine the motor pressure (PSI). 
  2. Next, determine the motor torque (in-lbs). 
  3. Next, gather the formula from above = HMD = T * 2*pi  / P.
  4. Finally, calculate the Hydraulic Motor Displacement.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

motor pressure (PSI) = 30

motor torque (in-lbs) = 50

HMD = T * 2*pi  / P = ?