Convert Stokes to Square inches per second
Convert Stokes (St) to Square inches per second (in²/s) instantly and accurately.
Conversion Formula
in²/s = St × 0.15500031
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 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.
Quick Reference Table
| Stokes (St) | Square inches per second (in²/s) |
|---|---|
| 1 St | 0.155 in²/s |
| 2 St | 0.310001 in²/s |
| 5 St | 0.775002 in²/s |
| 10 St | 1.55 in²/s |
| 25 St | 3.87501 in²/s |
| 50 St | 7.75002 in²/s |
| 100 St | 15.5 in²/s |