Enter the viscosity of two or more liquids into the Calculator. The calculator will evaluate the Viscosity Blending Index. 

Viscosity Blending Index Formula

VBI = 14.534 * ln[ln(v + .8)] + 10.975

Variables:

  • VBI is the Viscosity Blending Index ()
  • v is the viscosity of two or more liquid

How to Calculate Viscosity Blending Index?

The following steps outline how to calculate the Viscosity Blending Index.

  1. First, determine the viscosity of two or more liquids. 
  2. Next, gather the formula from above = VBI = 14.534 * ln[ln(v + .8)] + 10.975.
  3. Finally, calculate the Viscosity Blending Index.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

the viscosity of two or more liquids = 2.234