Viscosity Index Calculator

Calculate the Viscosity Index according to ASTM D2270 and visualize Temperature-Viscosity relationship per ASTM D341

cSt (mm²/s)
cSt (mm²/s)

Viscosity Index (VI)

100.0

Calculated per ASTM D2270

Temperature-Viscosity Relationship
Calculated according to ASTM D341 standard from 0°C to 150°C (32°F to 302°F)

Note: This calculator implements the ASTM D2270 standard for calculating the Viscosity Index and ASTM D341 for the temperature-viscosity relationship of petroleum products.

Valid for KV100 values from 2 cSt to 70+ cSt. Both viscosity values must be in centistokes (cSt) or mm²/s.