ISO VG ↔ SAE Viscosity Grade

Approximate mapping between ISO VG grade numbers (viscosity at 40 °C) and SAE J300 engine-oil / gear-oil grades.

Lubrication

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{ISO VG} \leftrightarrow \text{SAE}

Symbol	Meaning	Unit
$ISO VG$	ISO viscosity grade	cSt at 40 °C
$SAE$	SAE J300 grade number

Source: ISO 3448 - Viscosity classification; SAE J300 - Engine oil viscosity

Approximate mapping between ISO VG grade numbers (viscosity at 40 \u00b0C) and SAE J300 engine-oil / gear-oil grades.