Viscosity Blend Calculator

Calculate Blend Percentage Kinematic Viscosity @ 40 C (cSt)

Kinematic Viscosity @ 100 C (cSt)

Viscosity Blending Index @ 40 C

Viscosity Blending Index @ 100 C

Percentage of Percentage of Total Blend @ Total Blend @ 40 C 40 C

Low Vis Oil High Vis Oil Blended Oil

ASTM D341 Calculation A (ln(ln(Vb40)))

B (ln(ln(Vb100)))

C (ln(ln(VL40)))

D (ln(ln(VL100)))

E (ln(ln(VH40)))

F

Low Vis % (ln(ln(VH100))) High Vis %

Total Gallons Required of Blended Product Gallons of High Viscosity Oil Gallons of Low Viscosity Oil

Enter Gallons Required

Gallons of High Viscosity Oil Available Gallons of Low Viscosity Oil Required

Enter Gallons Available

Average Percentage Blend %

ter Gallons Required

ter Gallons Available

Enter the Kinematic Viscosity for the oils to be blended and the viscosity of final oil required (in the light green cells). The chart will calculate the percentage of Low Viscosity Oil and High Viscosity Oil needed to produce the Blended final product. The ASTM D341 method of calculating appears to be more accurate than the Viscosity Blend Index method.