Viscosity Index Calculator

If you know the viscosity of an oil at 40ºC and 100ºC, you can easily calculate its Viscosity Index (VI). The Viscosity Index is a measure of how much the viscosity changes with temperature; a higher VI indicates less change.

This calculator uses centi-Stokes (cSt), which are equivalent to mm^2/s. To get centiStokes from centiPoise, divide the centiPoise value by the fluid's density.

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