Enter your Calculation Type to switch between converting kinematic viscosity and fluid density into dynamic viscosity (or vice versa), or predicting how viscosity shifts between Temperature 1 and Temperature 2 using known viscosity values — your Primary Result, Secondary Result, and Viscosity Index update accordingly.
Primary Result
--
Secondary Result
--
Viscosity Index
--
Dynamic viscosity (measured in cP or mPa·s) is the absolute resistance to flow, while kinematic viscosity (measured in cSt or mm²/s) is dynamic viscosity divided by fluid density. Kinematic viscosity represents how fast a fluid flows under gravity.
Viscosity decreases as temperature increases for most liquids. This relationship follows the Andrade equation and can be used to predict viscosity at different temperatures when you know viscosity at two reference points.
Viscosity Index (VI) measures how much a fluid's viscosity changes with temperature. Higher VI values indicate less viscosity change with temperature, which is desirable for lubricants that must perform across varying temperatures.
Common units include centistokes (cSt) for kinematic viscosity, centipoise (cP) for dynamic viscosity, and SI units like mm²/s and mPa·s. The calculator converts between these units automatically.
Calculated values are estimates based on established correlations like the Andrade equation. For critical applications, always verify theoretical calculations with actual viscometer measurements under real operating conditions.
Water has about 1 cP at room temperature, light oils range from 10-100 cP, heavy oils can be 100-1000 cP, and very thick fluids like honey can exceed 10,000 cP.