Industrial Lubricants - Viscosities vs. ISO-VG Grade

ISO-VG viscosity grades for industrial lubricants. Convert between ISO-VG grades and equivalent SAE crankcase oil, aircraft oil, gear lube, and AGMA grades. Calculate absolute viscosity conversions between temperature scales and viscosity units.

Calculator

Inputs

Temperature (Fahrenheit) (°F)

Temperature (Celsius) (°C)

Viscosity (centiStoke) (cSt)

Viscosity (centiPoise) (cP)

Specific Gravity of Oil

Viscosity (Reyns) (lb s/in²)

Results

Temperature (Celsius)-- °C

Temperature (Fahrenheit)-- °F

Viscosity (centiPoise)-- cP

Viscosity (centiStoke)-- cSt

Viscosity (Pascal-Seconds)-- Pa·s

Viscosity (Reyns)-- lb s/in²

ISO-VG Grade	SAE Crankcase Oil	SAE Aircraft Oil	SAE Gear Lube	AGMA Regular
22	5W	—	—	—
32	10W	—	—	—
46	15W	—	75W	1
68	20W	—	—	2
100	30	65	80W-90	3
150	40	80	—	4
220	50	100	90	5
320	60	120	—	6
460	—	—	85W-140	7
680	—	—	—	8
1500	—	—	250	—

ISO-VG Viscosity Grade Standards

ISO VG stands for "International Standards Organization Viscosity Grade" and uses a numbering system ranging from 2 to 1500.

Temperature Conversion Formulas

Celsius to Fahrenheit: tF = 9/5 × tC + 32
Fahrenheit to Celsius: tC = 5/9 × (tF - 32)

Viscosity Unit Conversion Formulas

1 reyns (lb·s/in²) = 6896.55 Pa·s
1 cSt (centiStoke) = 1 cP (centiPoise) / SG
Where SG = specific gravity of oil

Common ISO-VG Applications

ISO-VG 22, 32: Light hydraulic oils, precision machinery
ISO-VG 46: Standard hydraulic and turbine oils
ISO-VG 68, 100: Heavy hydraulic applications
ISO-VG 150, 220: Gear oils, circulating oils
ISO-VG 320+: Heavy industrial gear oils