Convert Square millimetres per second to Stokes
Convert Square millimetres per second (mm²/s) to Stokes (St) instantly and accurately.
Conversion Formula
St = mm²/s × 0.01
About Square millimetres per second
The square millimetre per second (mm²/s) equals 10⁻⁶ m²/s, numerically identical to 1 centistoke (cSt). It is the preferred SI-consistent expression: ISO 3104, DIN 51562, and ASTM viscosity standards all use mm²/s interchangeably with cSt. Water at 20 °C ≈ 1.004 mm²/s; SAE 10W-30 at 100 °C: 9.3-12.5 mm²/s. 1 mm²/s = 1 cSt.
About Stokes
The stoke (St) equals 1 cm²/s = 10⁻⁴ m²/s, the CGS unit of kinematic viscosity named after Sir George Gabriel Stokes. Its hundredth part, the centistoke, is now dominant, but the stoke still appears in older fluid-mechanics texts and archival API and ASTM data. Water at 20 °C ≈ 0.01004 St; air at 20 °C ≈ 0.1516 St. 1 St = 100 cSt = 10⁻⁴ m²/s.
Quick Reference Table
| Square millimetres per second (mm²/s) | Stokes (St) |
|---|---|
| 1 mm²/s | 0.01 St |
| 2 mm²/s | 0.02 St |
| 5 mm²/s | 0.05 St |
| 10 mm²/s | 0.1 St |
| 25 mm²/s | 0.25 St |
| 50 mm²/s | 0.5 St |
| 100 mm²/s | 1 St |