Enter the actual volume capacity and the total swept volume into the calculator to determine the reciprocating compressor volumetric efficiency.

Reciprocating Compressor Volumetric Efficiency Formula

The following equation is used to calculate the Reciprocating Compressor Volumetric Efficiency.

Ev = Vs / Vd *100

  • Where Ev is the volumetric efficiency (%)
  • Vs is the actual volumetric capacity (m^3)
  • Vd is the total swept volume (m^3)

To calculate the volumetric efficiency of a compressor, divide the actual volume delivered by the swept volume.

What is a Volumetric Efficiency?


A volumetric efficiency is a ratio or percentage of the total volume of air delivered by a compressor compared to the total swept volume.

How to Calculate Reciprocating Compressor Volumetric Efficiency?

Example Problem:

The following example outlines the steps and information needed to calculate volumetric efficiency.

First, determine the total volumetric capacity delivered by the compressor. in this example, this is found to be 50m^3.

Next, determine the swept volume of the compressor. This is calculated to be 60m^3.

Finally, calculate the volumetric efficiency using the formula above:

Ev = Vs / Vd *100

Ev = 50/ 60 *100

Ev = 83.33 %