Viscosity (kinematic) converter
Viscosity (kinematic) Converter – 6 Units, Exact Factors
1 centistokes = 0.000001 square metres per second
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- 1 cSt = 0.000001 m²/s
- 5 cSt = 0.000005 m²/s
- 10 cSt = 0.00001 m²/s
- 25 cSt = 0.000025 m²/s
- Square metres per secondm²/s
- Square millimetres per secondmm²/s
- CentistokescSt
- StokesSt
- Square feet per secondft²/s
- Square inches per secondin²/s
- Square metres per second0.000001m²/s
- Square millimetres per second1mm²/s
- Centistokes1cSt
- Stokes0.01St
- Square feet per second0.000010764ft²/s
- Square inches per second0.00155in²/s
About viscosity (kinematic) conversions
Kinematic viscosity is dynamic viscosity divided by density. 1 cSt = 1 mm²/s exactly; ISO VG oil grades are rated in cSt at 40 °C.
Common viscosity (kinematic) conversions
Viscosity (kinematic) units explained
| Unit | System | Definition and notes |
|---|---|---|
| Square metre per second (m²/s) | SI (metric) | Base unit |
| Square millimetre per second (mm²/s) | SI (metric) | 1 mm²/s = 0.000001 m²/s (exact)Defined as exactly 1 centistokes. |
| Centistokes (cSt) | other | 1 cSt = 0.000001 m²/s (exact)Defined as exactly 1 mm²/s. Oil grades are specified in cSt. |
| Stokes (St) | other | 1 St = 0.0001 m²/s (exact)An older centimetre-gram-second unit: exactly 1 cm²/s, or 0.0001 m²/s. |
| Square foot per second (ft²/s) | US & imperial (identical) | 1 ft²/s = 0.09290304 m²/s (exact) |
| Square inch per second (in²/s) | US & imperial (identical) | 1 in²/s = 0.00064516 m²/s (exact) |
Centistokes to square metres per second conversion table
| Centistokes (cSt) | Square metres per second (m²/s) |
|---|---|
| 1 cSt | 0.000001 m²/s |
| 2 cSt | 0.000002 m²/s |
| 5 cSt | 0.000005 m²/s |
| 10 cSt | 0.00001 m²/s |
| 15 cSt | 0.000015 m²/s |
| 22 cSt | 0.000022 m²/s |
| 32 cSt | 0.000032 m²/s |
| 46 cSt | 0.000046 m²/s |
| 68 cSt | 0.000068 m²/s |
| 100 cSt | 0.0001 m²/s |
| 150 cSt | 0.00015 m²/s |
| 220 cSt | 0.00022 m²/s |
| 320 cSt | 0.00032 m²/s |
| 460 cSt | 0.00046 m²/s |
| 680 cSt | 0.00068 m²/s |
| 1,000 cSt | 0.001 m²/s |
Frequently asked questions
Which viscosity (kinematic) units can I convert?
square metres per second (m²/s), square millimetres per second (mm²/s), centistokes (cSt), stokes (St), square feet per second (ft²/s), square inches per second (in²/s).
How accurate are the results?
Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.
How do I convert kinematic viscosity to dynamic viscosity?
Multiply by the fluid density: μ = ν × ρ. For example 1 cSt (1 mm²/s) × 1 000 kg/m³ = 1 mPa·s. Use the compound converter if you need mixed units.