Viscosity Index (VI) Calculator
Viscosity index (VI) calculator from Kinematic Viscosity (KV) at 40 °C and 100 °C according to ASTM D2270-10 and ISO 2909.
Standard practice for viscosity index (VI) calculation as per ASTM D2270 and ISO 2909.
To calculate viscosity index we need viscosity of an oil both at 40°C and 100°C.
In the first row table 1, Enter kinematic viscosity (KV) at 40°C, In the same way enter kinematic viscosity @100°C in the second row. Click Calculate button to get viscosity index (VI).
Finally, press Clear button to start again.
Another possibility is to calculate kinematic viscosity from viscosity index.
Calculate Viscosity @100°C
Similarly with known viscosity index (VI) and viscosity @40°C; It is possible to calculate viscosity @100°C. For example enter viscosity index (VI) in the first row of second table. Enter kinematic viscosity (KV) @40°C in the second row. Click Calculate to get KV @100°C.
As previously stated, use Clear button to start a new calculation.
Calculate Viscosity @40°C
Likewise use calculator 3 to calculate viscosity (KV) @40°C. Enter known viscosity index (VI) and kinematic viscosity (KV) @100°C in table 3. Press Calculate button to calculate kinematic viscosity (KV) @40°C. As before, use Clear button to reset and calculate a new viscosity.