Enter the exhaust pressure (psi) and the inlet pressure (psi) into the Pressure Ratio Calculator. The calculator will evaluate and display the Pressure Ratio.

## Pressure Ratio Formula

The following formula is used to calculate the Pressure Ratio.

PUR = EP / IP
• Where PUR is the Pressure Ratio
• EP is the exhaust pressure (psi)
• IP is the inlet pressure (psi)

To calculate the pressure ratio, divide the exhaust pressure by the inlet pressure.

## How to Calculate Pressure Ratio?

The following example problems outline how to calculate Pressure Ratio.

Example Problem #1:

1. First, determine the exhaust pressure (psi).
• The exhaust pressure (psi) is given as: 30.
2. Next, determine the inlet pressure (psi).
• The inlet pressure (psi) is provided as: 15.
3. Finally, calculate the Pressure Ratio using the equation above:

PUR = EP / IP * 100

The values given above are inserted into the equation below and the solution is calculated:

PUR = 30 / 15 * 100 = 200 (%)

Example Problem #2:

For this problem, the variables required are provided below:

exhaust pressure (psi) = 50

inlet pressure (psi) = 20