Viscosity Index describes the rate of viscosity change as a function of
temperature and is defined by ASTM D 2270. This method uses the
kinematic viscosity at 40°C and 100°C to determine VI. Use the following
calculators to determine fluid viscosity or VI. Fluids meeting the MEHF
performance definition will have a viscosity index that is greater than 150.

I want to calculate:

Viscosity Index (VI) – Input the fluid viscosity values at 40ºC and 100ºC and click "Calculate."

Kinematic Viscosity @ 100ºC – Input the fluid VI and viscosity value at 40ºC and click "Calculate."

Kinematic Viscosity @ 40ºC – Input the fluid VI and viscosity value at 100ºC and click "Calculate."

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