Enter the motor displacement (in^3/rev) and the motor RPM into the calculator to determine the hydraulic motor flow.

## Hydraulic Motor Formula

The following formula is used to calculate the flow required to fuel a hydraulic motor.

HF = D * RPM /231

• Where HF is the hydraulic motor flow required (GPM)
• D is the motor displacement (in^3 / rev)
• RPM is the rotations per minute of the motor

Similarly, the RPM can also be calculated by re-arranging the equation above to the following:

RPM = HF / D * 231

Where RPM is the motor speed in rotation per minute.

## What is a hydraulic motor?

A hydraulic motor is a type of motor that runs on hydraulic fluid flow in order to produce rotation and torque within the motor.

## How to calculate hydraulic motor flow?

The following example outlines the steps needed to calculate the volumetric flow of a hydraulic motor.

First, determine the motor displacement. This should be in units of cubic inches per revolution. For this example, the motor displacement is 4 in^3/rev.

Next, determine the motor RPM. In this case, the motor has a designed RPM of 2000.

Finally, calculate the required flow in order to run the motor at the speed above.

HF = D * RPM /231

HF = 4 * 2000 /231

HF = 34.63 GPM