Convert Square inches per second to Stokes
Convert Square inches per second (in²/s) to Stokes (St) instantly and accurately.
Conversion Formula
St = in²/s × 6.4516
About Square inches per second
The square inch per second (in²/s) equals 0.0254² = 6.4516 × 10⁻⁴ m²/s. It is the coherent FPS kinematic unit based on the inch, found in US fluid power, hydraulics, and bearing-design references. 1 in²/s = 645.16 cSt = 6.4516 St.
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 inches per second (in²/s) | Stokes (St) |
|---|---|
| 1 in²/s | 6.4516 St |
| 2 in²/s | 12.9032 St |
| 5 in²/s | 32.258 St |
| 10 in²/s | 64.516 St |
| 25 in²/s | 161.29 St |
| 50 in²/s | 322.58 St |
| 100 in²/s | 645.16 St |