Kinematic Viscosity Converter

Convert kinematic viscosity between m²/s, mm²/s, cm²/s, St, cSt, ft²/s, and in²/s for lubrication specs, property tables, and engineering checks.

Convert kinematic viscosity between SI, CGS, and imperial area-per-time units used in fluid-property tables, lubrication specs, and process references.

Common presets

Interpretation

Kinematic viscosity is the area-per-time form of viscosity and should not be confused with dynamic viscosity. Translating between the two requires density under the stated conditions.

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

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Fluid Properties

Kinematic viscosity converter: m²/s, cSt, St, and imperial units explained

A kinematic viscosity converter helps you restate the same viscosity value in the unit a lubrication chart, process table, or engineering note expects. That matters because many practical references use cSt while SI-first treatments use m²/s.

What kinematic viscosity measures

Kinematic viscosity is the ratio of dynamic viscosity to density. It represents viscosity in area-per-time form, which is why units such as m²/s and cSt appear in fluid-property tables.

The value can be rewritten between SI, CGS, and imperial units without changing the underlying stated property.

ν = μ / ρ

Defines kinematic viscosity as dynamic viscosity divided by density.

1 cSt = 1 mm²/s

Shows the exact numerical equivalence between centistokes and square millimetres per second.

1 St = 10⁻4 m²/s

Links the CGS stokes unit to the coherent SI area-per-time form.

Why this is not the same as dynamic viscosity

Dynamic and kinematic viscosity are related, but they are not interchangeable without density. That is why a converter should translate one family honestly instead of pretending it can jump between them without more data.

This page therefore stays in kinematic-viscosity units only and leaves density-dependent calculations to a separate workflow.

Why cSt is common in specs even though m²/s is SI

The coherent SI unit for kinematic viscosity is m²/s, but the values encountered in lubrication and hydraulic work are often more readable in cSt or mm²/s.

That is why a spec sheet may show 32 cSt while a standards-first engineering treatment writes the same property as 3.2 × 10⁻5 m²/s. The converter keeps those reporting scales aligned.

Further reading

Frequently asked questions

Is cSt the same as mm²/s?

Yes. One centistoke is numerically equal to one square millimetre per second, which is why the two often appear together on lubricant datasheets.

 Can this page convert cSt to cP?

Not by itself. Converting between kinematic and dynamic viscosity requires density under the stated conditions.

 Why do many oil datasheets use cSt?

Because it gives practical values without long decimal strings. The same property in m²/s is correct but often less convenient to read in everyday specification work.

 Does kinematic viscosity stay constant with temperature?

No. Like other fluid properties, it changes with conditions. This page only translates the reported value you already have.

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