Viscosity Index Calculator

Calculate Viscosity Index





Formula

The formula to calculate the Viscosity Index (VI) is:

\[ VI = \frac{L - U}{L - H} \]

Where:

Definitions

Example

Let's say the kinematic viscosity of oil at 40°C of 0 (L) is 100, the kinematic viscosity of the lubricant (U) is 80, and the kinematic viscosity of oil at 40°C of 100 (H) is 60. Using the formula:

\[ VI = \frac{100 - 80}{100 - 60} \]

We get:

\[ VI = 0.50 \]

So, the viscosity index is 0.50.