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Kinematic viscosity — a fluid's dynamic viscosity divided by its density — is measured in square meters per second in the SI system, but centistokes is the standard unit in automotive and industrial lubricant specifications. This calculator converts between square meters per second, Stokes, and centistokes.
Unlike dynamic viscosity, kinematic viscosity accounts for the fluid's density, which is why engine oil grades and lubricant datasheets almost always specify it in centistokes rather than the dynamic-viscosity units.
How it works
Enter a value, choose the unit you're converting from and to, and the calculator applies the standard conversion factor between square meters per second, Stokes, and centistokes.
- Enter value.
- Enter from.
- Enter to.
- Click Calculate to see your results.
Examples
An engine oil specification
A motor oil rated at 100 centistokes converts to 0.0001 square meters per second, the SI-standard way the value would appear in an engineering calculation.
Comparing lubricant datasheets
A lubricant's viscosity reported in Stokes is converted to centistokes to compare against a more common automotive datasheet format.
Who should use it
- Converting an engine oil or lubricant viscosity rating between unit systems.
- Comparing kinematic viscosity values across different industrial datasheets.
Industry applications
- Automotive and lubricant engineering
- Fluid dynamics and mechanical engineering
Advantages
- Covers the SI unit and both common CGS-derived units (Stokes and centistokes).
- Shows the exact conversion factor used, not just the final answer.
- No account, subscription or watermark.
Limitations
- Covers kinematic viscosity only — for dynamic viscosity, use the dedicated Dynamic Viscosity Converter instead.
Common mistakes to avoid
- Confusing kinematic viscosity with dynamic viscosity, which are related but measure different things.
- Mixing up Stokes and centistokes, which differ by a factor of 100.
Best practices
- Use centistokes for lubricant and automotive specifications, since that's the industry-standard unit.
- Convert to dynamic viscosity using the fluid's density if you need dynamic viscosity specifically — this tool covers kinematic viscosity only.
Tips
- Centistokes is the standard unit for automotive and industrial lubricant specifications — use it as your default when in doubt.
- Remember that kinematic viscosity depends on density, so it isn't directly interchangeable with dynamic viscosity without that conversion.