Overall pressure ratio

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In aeronautical engineering, overall pressure ratio, or overall compression ratio, is the amount of times the pressure increases due to ram compression and the work done by the compressor stages. The compressor pressure ratio is the ratio of the stagnation pressures at the front and rear of the compressor of a gas turbine.

Overall pressure ratio in a high-bypass turbofan is a function of inlet pressure ratio and compressor pressure ratio: $${\displaystyle OPR=IPR\times CPR}$$

The terms compression ratio and pressure ratio are used interchangeably.^[1]