Viscosity
Sttomm²/s
Convert stokes (St) to square millimetres per second (mm²/s).
Factor1 St = 100 mm²/s
Converter
St
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mm²/s
Rendered to 6 significant figures.
Formula
Formula
mm²/s = St × 100
Multiply any value in stokes by 100 to obtain the value in square millimetres per second.
Worked example
Convert 1 St to mm²/s.
- 01Start with 1 St.
- 02Multiply by the conversion factor: 1 × 100 = 100 mm²/s.
Result1 St = 100 mm²/s
Conversion table
| St | mm²/s |
|---|---|
| 1 | 100 |
| 2 | 200 |
| 5 | 500 |
| 10 | 1000 |
| 20 | 2000 |
| 50 | 5000 |
| 100 | 10000 |
| 200 | 20000 |
| 500 | 50000 |
| 1000 | 1.0000e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from St to mm²/s?
1 St equals 100 mm²/s. To convert, multiply the value in stokes by 100.
How do I convert 1 St to mm²/s?
1 St = 100 mm²/s. For any value, multiply by 100.
How do I convert mm²/s back to St?
Divide by the same factor — or equivalently, multiply by 0.01. So 1 mm²/s = 0.01 St.
When would I need to convert stoke to square millimetre per second?
Kinematic viscosity conversions between St and mm²/s arise in hydraulic fluid selection, lubricant grading (ISO VG), pipe flow Reynolds number calculations, and fuel-oil specification. Kinematic viscosity equals dynamic viscosity divided by fluid density and cannot be directly compared to dynamic viscosity without that context.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).