Free Engineering Tool #252

Viscosity Unit Converter

Convert between kinematic and dynamic viscosity units. Enter density for dynamic↔kinematic conversion.

cSt ↔ cPSUS ↔ °ENeeds Density

Results

Kinematic: cSt

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Kinematic: m²/s

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Dynamic: cP

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Dynamic: Pa·s

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SUS (approx)

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Kinematic ν (cSt) × density ρ (g/cm³) = Dynamic μ (cP)

SUS ≈ 4.632 × cSt (for ν > 50 cSt)

Kinematic ν = μ/ρ. Dynamic (μ) includes density effect. Kinematic in cSt, dynamic in cP.

To convert between kinematic (cSt) and dynamic (cP): cP = cSt × density(g/cm³).

Saybolt Universal Seconds — time for 60 mL to flow through a calibrated orifice. Older unit still used in US.

ISO Viscosity Grade = midpoint kinematic viscosity at 40°C in cSt. VG32 = 32 cSt at 40°C.

Viscosity decreases with temperature. Use the Walther equation or viscosity-temperature charts.