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Pressure drop

Compressed Air Pressure Drop Calculator

Estimate straight-run compressed-air pressure drop from flow, pipe length, internal diameter, working pressure, and equivalent fitting length.

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Pressure drop

Run the calculation

Estimate straight-run compressed-air pressure drop from flow, pipe length, internal diameter, working pressure, and equivalent fitting length.

Engineering inputsPressure Drop Calculator

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

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

Engineering visual

Pressure Drop Calculator calculation map

Airflow moves through a pipe with defined inside diameter and length; fittings and wall friction consume pressure along the route.

Pressure Drop Calculator calculation mapAirflow moves through a pipe with defined inside diameter and length; fittings and wall friction consume pressure along the route.PIPE LENGTH L + FITTINGSID DFLOW QPRESSURE LOSS Δp
  1. 01Flow
  2. 02Calculate and compare
  3. 03Pressure drop
Estimated pressure drop
Estimated pressure drop
Estimated outlet pressure
Drop vs supply

Calculation reference

What this tool checks.

This is a simplified empirical estimate for clean compressed-air piping. Detailed design should include fittings, material, branches, temperature, and measured demand.

Inputs

  • Flow
  • Pipe length
  • Equivalent fitting length
  • Internal diameter
  • Working pressure

Outputs

  • Pressure drop
  • Outlet pressure
  • Drop as percent of supply

Engineering guide

Use the result with the right context.

Calculate pressure drop calculator from application data and interpret the result for preliminary pneumatic engineering review.

Calculation workflow

  1. Enter the known application values, including Flow, Pipe length, Equivalent fitting length.

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

  3. Review Pressure drop, Outlet pressure, Drop as percent of supply, then compare the result with the component datasheet and application margin.

Assumptions and limits

  • Treat catalog flow coefficients and conductance values as component-specific data measured under stated reference conditions.

  • Validate tubing, fittings, silencers, manifolds, temperature, and simultaneous demand as part of the complete flow path.

FAQ

Common review questions.

01Tool noteWhy include equivalent fitting length?

Elbows, tees, valves, couplers, and filters add resistance. Equivalent length is a practical way to include those losses in an early estimate.

02Tool noteWhen should pressure drop be measured instead of estimated?

Measure pressure at the source and point of use when symptoms include weak motion, slow cylinders, unstable regulators, or high demand during machine cycles.

03Tool noteWhat should I verify after using the Pressure Drop 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.