Convert Stokes to Square millimetres per second
Convert Stokes (St) to Square millimetres per second (mm²/s) instantly and accurately.
Conversion Formula
mm²/s = St × 100
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.
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.
Quick Reference Table
| Stokes (St) | Square millimetres per second (mm²/s) |
|---|---|
| 1 St | 100 mm²/s |
| 2 St | 200 mm²/s |
| 5 St | 500 mm²/s |
| 10 St | 1000 mm²/s |
| 25 St | 2500 mm²/s |
| 50 St | 5000 mm²/s |
| 100 St | 10000 mm²/s |