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

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## Pressure Ratio Formula

The following formula is used to calculate the Pressure Ratio.

**PUR = EP / IP * 100**

- Where PUR is the Pressure Ratio (%)
- EP is the exhaust pressure (psi)
- IP is the inlet pressure (psi)

## How to Calculate Pressure Ratio?

The following example problems outline how to calculate Pressure Ratio.

Example Problem #1:

- First, determine the exhaust pressure (psi).
- The exhaust pressure (psi) is given as: 30.

- Next, determine the inlet pressure (psi).
- The inlet pressure (psi) is provided as: 15.

- 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

Test your knowledge using the equation and check your answer with the calculator above.

PUR = EP / IP * 100** = ?**