Standards-based tools for blending engineers and formulation chemists. Pick a tool, compute inline — no reloads, no registration.
Convert viscosity, temperature, concentration, and density units used in lubricant formulation.
Viscosity (cSt ↔ SUS) — ASTM D2161:
SUS ≤ 215: v = 0.2253 × SUS − 194.4 / SUS
SUS > 215: v = 0.2193 × SUS − 134.7 / SUS Temperature: °F = °C × 9/5 + 32
Concentration: 1 ppm = 1 mg/kg = 0.0001 wt%
Density: 1 g/cm³ = 8.3454 lb/US gal
API Gravity: °API = 141.5 ÷ SG₆₀ − 131.5cSt↔SUS per ASTM D2161; density per ASTM D1250; API Gravity per API MPMS.
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