How do you size a pump package quickly?

Multiply flow by head, apply a conversion coefficient, then a process efficiency multiplier. With flow 100, head 4, a 0.005 coefficient, and a 1.0 multiplier, the sizing figure is 2 units.

What is the conversion factor for in pump sizing?

It folds unit conversions and hydraulic coefficients - like the constant that turns flow times head into power - into one number. The 0.005 in the example is that coefficient; change it to match your unit system.

What does the process multiplier do?

It scales the result for efficiency or a process derate. A multiplier of 1.0 leaves the base product unchanged at 2; drop it below 1 to account for pump or driver efficiency losses.

Is this a substitute for a pump curve?

No. This is a first-pass ballpark. A real selection needs the manufacturer's pump curve, efficiency at the duty point, NPSH available versus required, and viscosity correction. Use this to get in the right range, then verify.

Why is flow times head only 400 before the coefficient?

The base product of flow 100 and head 4 is 400; the 0.005 conversion coefficient scales it to 2, and the 1.0 multiplier leaves it there. The coefficient is what maps the raw product into your target units.

How do I use this for a multi-pump skid?

Size each duty point separately, then check that the combined flow and head match the skid's manifold and header design. This tool sizes one duty at a time.

Process Skids, Modular Equipment & Packaged Plants calculator

Pump Package Sizing Calculator

Pump Package Sizing multiplies a flow-related first factor, a head- or pressure-related second factor, a conversion factor, and a process efficiency multiplier to produce a quick sizing number for a packaged pump skid. Rotating-equipment engineers and skid packagers use it as a fast first pass to gauge hydraulic duty - typically a proxy for power or capacity - before running a full pump curve and NPSH check. On modular pump skids where motor frame, baseplate, and driver all key off the duty point, a defensible ballpark early keeps the whole package sized consistently. The conversion factor lets you fold in unit conversions or coefficients so the output lands in the units you need.

What this calculator does

Pump Package Sizing multiplies a flow-related first factor, a head- or pressure-related second factor, a conversion factor, and a process efficiency multiplier to produce a quick sizing number for a packaged pump skid.
Use it when pump package sizing in process skids, modular equipment and packaged plants needs a few factors combined into one defensible number for process skids, modular equipment and packaged plants.
Computes a product of a first factor, a second factor, a conversion factor, and a process multiplier to give a single sizing figure.

Formula used

Pump Package Sizing = first factor × second factor × conversion factor × process multiplier
Use the multiplier for unit conversion or process efficiency

Inputs explained

Flow rate (first duty factor):
Head or pressure (second duty factor):
Unit conversion / hydraulic coefficient:
Process efficiency multiplier:

How to use the result

Use it as an early hydraulic sizing estimate for a pump skid before detailed curve, efficiency, and NPSH analysis.
It is a linear product, not a real pump-affinity or hydraulic-power calculation; it cannot capture efficiency curves, viscosity effects, or NPSH margins.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you size a pump package quickly? Multiply flow by head, apply a conversion coefficient, then a process efficiency multiplier. With flow 100, head 4, a 0.005 coefficient, and a 1.0 multiplier, the sizing figure is 2 units.
What is the conversion factor for in pump sizing? It folds unit conversions and hydraulic coefficients - like the constant that turns flow times head into power - into one number. The 0.005 in the example is that coefficient; change it to match your unit system.
What does the process multiplier do? It scales the result for efficiency or a process derate. A multiplier of 1.0 leaves the base product unchanged at 2; drop it below 1 to account for pump or driver efficiency losses.
Is this a substitute for a pump curve? No. This is a first-pass ballpark. A real selection needs the manufacturer's pump curve, efficiency at the duty point, NPSH available versus required, and viscosity correction. Use this to get in the right range, then verify.
Why is flow times head only 400 before the coefficient? The base product of flow 100 and head 4 is 400; the 0.005 conversion coefficient scales it to 2, and the 1.0 multiplier leaves it there. The coefficient is what maps the raw product into your target units.

Last reviewed 2026-05-12.