Enter the pump RPM and the pump displacement (in^3/revolution) into the RPM to Flow Rate Calculator. The calculator will evaluate the RPM to Flow Rate.

## RPM to Flow Rate Formula

The following two example problems outline the steps and information needed to calculate the RPM to Flow Rate.

FR = RPM * D / 231
• Where FR is the RPM to Flow Rate (GPM)
• RPM is the pump RPM
• D is the pump displacement (in^3/revolution)

To calculate a flow rate from RPM, multiply the RPM by the displacement, then divide by 231.

## How to Calculate RPM to Flow Rate?

The following example problems outline how to calculate RPM to Flow Rate.

Example Problem #1:

1. First, determine the pump RPM.
• The pump RPM is given as: 400.
2. Next, determine the pump displacement (in^3/revolution).
• The pump displacement (in^3/revolution) is provided as: 2.5.
3. Finally, calculate the RPM to Flow Rate using the equation above:

FR = RPM * D / 231

The values provided above are inserted into the equation below and computed.

FR = 400 * 2.5 / 231 = 4.239 (GPM)

Example Problem #2:

For this problem, the variables required are provided below:

pump RPM = 600

pump displacement (in^3/revolution) = 3