Convert between dynamic viscosity (Poise) and kinematic viscosity (Stokes) using fluid density.
Last updated: March 2026 | By ForgeCalc Engineering
100 cP (Centipoise)
100 cSt (Centistokes)
Viscosity is a measure of a fluid's resistance to flow. There are two main types: Dynamic Viscosity (absolute) and Kinematic Viscosity. Dynamic viscosity measures the internal friction of a fluid, while kinematic viscosity is the ratio of dynamic viscosity to density.
The Poise (P) is the CGS unit for dynamic viscosity, named after Jean Léonard Marie Poiseuille. The Stokes (St) is the CGS unit for kinematic viscosity, named after George Gabriel Stokes. In many industrial applications, the smaller units Centipoise (cP) and Centistokes (cSt) are more commonly used.
Convert the viscosity of a specific oil:
Calculation: ν = 0.85 / 0.92
Final Answer: The kinematic viscosity is 0.923913 Stokes or 92.3913 cSt.
1 Poise is equal to 0.1 Pascal-second (Pa·s). Therefore, 10 Poise = 1 Pa·s.
Centistokes (cSt) are more convenient because many common fluids (like water at 20°C, which is ~1 cSt) have values that are easier to work with in this unit.
Yes, viscosity is highly temperature-dependent. Most fluids become less viscous as temperature increases.
Multiply Centistokes by the fluid's density (g/cm³) to get Centipoise: cP = cSt × ρ.
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