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.

- First, determine the viscosity of two or more liquids.
- Next, gather the formula from above = VBI = 14.534 * ln[ln(v + .8)] + 10.975.
- Finally, calculate the Viscosity Blending Index.
- 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