Viscosity Unit Converter
Convert between dynamic and kinematic viscosity units
Input
Enter viscosity value and select units
Viscosity Types
- Dynamic (Absolute): Resistance to flow under applied force (cP, Poise, Pa.s)
- Kinematic: Dynamic viscosity / density (cSt, Stokes, m2/s)
- Relationship: cSt = cP / SG (at same temperature)
Conversion Results
Enter values and click Convert to see results
Reference
Common Petroleum Fluid Viscosities
| Fluid | Temp | Viscosity (cP) | Viscosity (cSt) |
|---|---|---|---|
| Water | 68F | 1.0 | 1.0 |
| Light Crude Oil | 100F | 2-10 | 2.5-12 |
| Medium Crude Oil | 100F | 10-50 | 12-55 |
| Heavy Crude Oil | 100F | 50-5000 | 50-5500 |
| Diesel | 100F | 2-4 | 2.5-5 |
| Gasoline | 60F | 0.4-0.8 | 0.5-1.1 |
| Drilling Mud | 120F | 15-40 | - |
Conversion Formulas
DYNAMIC VISCOSITY:
1 cP = 0.01 P = 1 mPa.s = 0.001 Pa.s
1 Pa.s = 1000 cP = 10 P
1 lbf.s/ft2 = 47880.26 cP
KINEMATIC VISCOSITY:
1 cSt = 0.01 St = 1e-6 m2/s
1 m2/s = 1e6 cSt = 10.764 ft2/s
DYNAMIC to KINEMATIC:
cSt = cP / density(g/cm3)
cP = cSt * density(g/cm3)
Saybolt Universal (SSU) Conversion
For SSU >= 100:
cSt = 0.2158 * SSU - 194.4/SSU
For SSU < 100:
cSt = 0.2262 * SSU - 195/SSU
Approximate inverse (cSt to SSU):
SSU = 4.6324 * cSt + sqrt(21.446 * cSt^2 + 856.68)
(for cSt > 1.8)
Other Empirical Conversions
SAYBOLT FUROL (SSF) - for heavy oils:
cSt = 2.12 * SSF - 60/SSF (for SSF >= 25)
REDWOOD No.1:
cSt = 0.26 * RE - 179/RE (for RE >= 34)
ENGLER DEGREES:
cSt = 7.6 * E - 6.3/E (approximate)