Formula notes and assumptions
- The VI calculator follows ISO 2909 / ASTM D2270-style calculation and keeps the current useful range warning of VI 60 to 350.
- The interpolation calculator uses the ASTM D341 Ubbelohde-Walther relationship with
v + 0.7. - For formulas and concept background, see the TriboNet viscosity index article.
More tribology calculators
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Contact Mechanics
Lubrication and Viscosity
Wear and Bearing Screening
Hardness and Material Properties
Indentation and Rough Surfaces
- Adhesion Calculator for Rough Surfaces – Bearing Area Model
- Cone with a Parabolic Cap
- Indentation by a Flat Elliptical Punch
- Indentation of Elastic Body by Sinusoidal Surface
- Indentation of Elastic Plane by Truncated Cone
- Rigid Cone on Elastic Flat
- Rigid Flat Punch on Flat
- Surface Roughness Unit / Parameter Helper
- Truncated Paraboloid on Elastic Flat
