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Pressure ratio

Compression Ratio Calculator

Compare inlet and outlet pressure as an absolute compression ratio for pneumatic pressure design and booster/regulator review.

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Pressure ratio

Run the calculation

Compare inlet and outlet pressure as an absolute compression ratio for pneumatic pressure design and booster/regulator review.

Engineering inputsCompression Ratio Calculator

Enter the known application values. Outputs update instantly as units or assumptions change.

Pressure type
Pressure unit
Use these values for preliminary sizing before final datasheet review.

Engineering visual

Compression Ratio Calculator calculation map

The system schematic follows air from supply through storage and distribution to demand while preserving the selected reference pressure, temperature, and flow basis.

Compression Ratio Calculator calculation mapThe system schematic follows air from supply through storage and distribution to demand while preserving the selected reference pressure, temperature, and flow basis.SUPPLYSTORAGEp / VREFERENCE FLOW QDISTRIBUTED DEMAND
  1. 01Pressure type
  2. 02Calculate and compare
  3. 03Compression ratio
Compression ratio
Outlet absolute
Inlet absolute

Calculation reference

What this tool checks.

Gauge pressure is converted to absolute pressure before calculating the ratio.

Inputs

  • Pressure type
  • Outlet pressure
  • Inlet pressure
  • Pressure unit

Outputs

  • Compression ratio
  • Outlet absolute pressure
  • Inlet absolute pressure

Engineering guide

Use the result with the right context.

Use your application data for a preliminary estimate, then check the result against the relevant technical or official guidance.

Calculation workflow

  1. Enter the known application values, including Pressure type, Outlet pressure, Inlet pressure.

  2. Run the calculation using one consistent set of units and reference conditions.

  3. Review Compression ratio, Outlet absolute pressure, Inlet absolute pressure, then compare the result with the component datasheet and application margin.

Assumptions and limits

  • Keep standard, free-air, and actual compressed-volume reference states consistent throughout the calculation.

  • Confirm compressor, dryer, filter, receiver, pipework, ambient, and operating schedules with measured plant data.

FAQ

Common review questions.

01Tool noteWhy does compression ratio use absolute pressure?

Ratios compare total pressure energy, so gauge pressure must be converted to absolute pressure before division.

02Tool noteWhere is compression ratio useful in pneumatics?

It is useful when reviewing boosters, regulators, compressor stages, and pressure requirements across a pneumatic system.

03Tool noteWhat should I verify after using the Compression Ratio Calculator?

Check the entered units and reference conditions, then compare the calculated outputs with manufacturer ratings, application safety margins, transient loads, installation losses, and measured machine performance.