Enter the compression ratio into the calculator to convert into pounds per square inch.

Compression Ratio to PSI Formula

The following formula is used to convert a compression ratio to PSI.


  • Where PSI is the pounds per square inch
  • X:Y is the compression ratio
  • P is the pressure (typically standard atmospheric pressure (14.696)

Compression Ratio to PSI Example

How to convert compression ratio to psi?

  1. First, determine the compression ratio.

    Calculate or measure the compression ratio.

  2. Next, determine the pressure.

    Calculate or measure the atmospheric pressure. This is 14.696 PSI at sea level.

  3. Finally, calculate the PSI.

    Calculate the PSI using the equation above.


How to do you convert a compression ratio to a PSI?

Convert a compression ratio to PSI by multiplying the atmospheric pressure by the compression ratio.

compression ratio to psi calculator
compression ratio to PSI formula