Dynamic Viscosity Converter

Convert dynamic viscosity between Pa·s, mPa·s, cP, P, lbm/(ft·s), lbm/(ft·h), kg/(m·s), and slug/(ft·s) for fluid-property and process work.

Convert dynamic viscosity between SI, CGS, and explicit mass-based US customary units used in process sheets, laboratory notes, and equipment references.

Common presets

Interpretation

Dynamic viscosity depends on temperature, pressure, and composition. This page translates the stated value only and keeps pound-mass notation explicit so it is not confused with force-based units.

Enter values Provide a non-negative dynamic-viscosity value to compare the supported SI, CGS, and imperial mass-based units.

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Fluid Properties

Dynamic viscosity converter: Pa·s, mPa·s, cP, and mass-based imperial units explained

A dynamic viscosity converter rewrites the same shear-resistance value in the unit your laboratory note, fluid-property table, or process spec expects. That is useful because viscosity data frequently moves between SI forms such as Pa·s and CGS forms such as centipoise.

What dynamic viscosity measures

Dynamic viscosity measures a fluid’s resistance to shear. It links shear stress to the velocity gradient in laminar flow, which is why it appears in fluid mechanics, lubrication data, and process-property sheets.

The quantity does not change when you rewrite it from Pa·s to cP or P. Only the reporting scale changes.

τ = μ × (du / dy)

Shows dynamic viscosity as the proportionality between shear stress and velocity gradient.

1 Pa·s = 1,000 cP

Links the coherent SI unit to the common centipoise lab scale.

1 P = 0.1 Pa·s

Shows the CGS poise relationship used in many older references.

Why temperature and pressure still matter

Viscosity is not a fixed label detached from conditions. Liquids and gases can change viscosity materially with temperature, pressure, and composition, so a converter should only translate the stated value you already have.

That means this page is useful for unit work, not for predicting how viscosity changes when the fluid state changes.

Why the pound label needs care

Imperial-style viscosity references can be ambiguous because some tables use pound-mass notation while others use force-based expressions. Those are not interchangeable.

This converter keeps the supported US customary entries explicit as mass-based units such as lbm/(ft·s) so the conversion factors stay clear and auditable.

Further reading

Frequently asked questions

Is cP the same as mPa·s?

Yes. One centipoise is numerically equal to one millipascal-second, which is why those two units are often used interchangeably in practice.

 Why does viscosity need a temperature note?

Because viscosity changes with fluid state. A number reported at one temperature may not describe the same fluid accurately at another temperature.

 Can this page convert dynamic viscosity to kinematic viscosity?

No. That requires density. This converter translates dynamic-viscosity units only.

 Does lbm/(ft·s) mean the same as lbf·s/ft²?

No. Those are different unit systems with different conversion factors. This page keeps the supported imperial entries mass-based to avoid that ambiguity.

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