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Viscosity kinematic Converter

Convert kinematic viscosity units like stokes, centistokes.

Convert Units

From:

To:

Result:

Convert kinematic viscosity measurements between stokes, centistokes, and more.

What is Kinematic Viscosity Converter?

Kinematic viscosity is the ratio of a fluid's dynamic viscosity to its density. It describes how a fluid flows under gravity without an applied force. It is the key parameter for oil grading, hydraulic system design, and aerodynamics.

Understanding the Units

Square metre/second (m²/s)

The SI unit of kinematic viscosity.

Common Uses: Scientific calculations

Stokes (St)

CGS unit of kinematic viscosity.

Common Uses: Fluid mechanics literature

Conversion: 1 St = 0.0001 m²/s

Centistokes (cSt)

One-hundredth of a stokes; equal to 1 mm²/s. The most common practical unit.

Common Uses: Automotive oil grades, hydraulic fluids, lubrication

Conversion: 1 cSt = 10⁻⁶ m²/s

Common Conversions

Water at 20°C: ~1 cSt = 1 mm²/s
Motor oil SAE 30: ~100 cSt at 40°C
Gasoline: ~0.5–0.6 cSt
Mercury: ~0.12 cSt (low, despite high density)
Gear oil SAE 90: ~200 cSt at 40°C

Conversion Formulas

Kinematic viscosity = Dynamic viscosity ÷ Density (ν = μ/ρ)
m²/s to stokes: St = m²/s × 10,000
Stokes to centistokes: cSt = St × 100
m²/s to centistokes: cSt = m²/s × 1,000,000

Practical Examples

Engine oil grade (e.g. SAE 10W-40) is defined by kinematic viscosity at 40°C and 100°C

Hydraulic fluid selection depends on operating temperature range and required cSt rating

Aviation turbine oil: ~8 cSt at 100°C for reliable high-temp lubrication

When to Use Each Unit

m²/s: SI unit, scientific and academic calculations

Centistokes (cSt): Automotive, industrial, and lubrication engineering applications

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