Tribology Calculators

Viscosity, film thickness, wear rate. Engineering calculations with the equations and standards they come from.

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Calculators

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Viscosity & Lubricants

Oil Blend Viscosity Calculator

Enter the viscosity of two oils and a mixing ratio, get the blended kinematic viscosity.

ASTM D341Refutas

Viscosity Index & Temperature Calculator

Enter KV40 and KV100, get the viscosity index and the viscosity–temperature curve.

ASTM D2270ISO 2909ASTM D341

Lubrication & Film Thickness

Lambda Ratio Calculator

Enter load, speed, viscosity, and roughness, get minimum film thickness, λ ratio, Hertzian pressure, and the lubrication regime.

Hamrock–DowsonHertz

Stribeck Curve Visualizer

Move viscosity, speed, pressure, and roughness to see where the friction coefficient sits across boundary, mixed, and hydrodynamic lubrication.

Stribeck

Wear

Specific Wear Rate Calculator

Enter a surface height map (BCRF / SDF / ASCII) or scar dimensions with load and sliding distance, get wear volume and specific wear rate k [mm³/(N·m)].

ArchardASTM G99

Coming soon

Contact Pressure Calculator

Hertzian contact pressure distribution for ball-on-flat, ball-on-ball, and cylinder-on-flat.

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About the author

Takeru Omiya, Ph.D.

Tribology researcher working at the intersection of lubricant additives, DLC coatings, and machine learning — data-driven lubrication design.

—Ph.D. in Mechanical Engineering, University of Coimbra (2025)
—Collaborating Member, CEMMPRE, University of Coimbra
—STLE Early Career Award
—Editorial Committee, Japanese Society of Tribologists
—~20 peer-reviewed papers / h-index 9