Convert Square inches per second to Centistokes
Convert Square inches per second (in²/s) to Centistokes (cSt) instantly and accurately.
Conversion Formula
cSt = in²/s × 645.16
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 Centistokes
The centistoke (cSt) equals 10⁻⁶ m²/s = 1 mm²/s. It is the dominant unit for kinematic viscosity in industry worldwide. ASTM D445, ISO 3104, and ACEA lubricant specifications all use cSt. Water at 20 °C ≈ 1.004 cSt; diesel at 40 °C: 2.0-4.5 cSt; SAE 40 oil at 100 °C: 12.5-16.3 cSt. 1 cSt = 10⁻² St.
Quick Reference Table
| Square inches per second (in²/s) | Centistokes (cSt) |
|---|---|
| 1 in²/s | 645.16 cSt |
| 2 in²/s | 1290.32 cSt |
| 5 in²/s | 3225.8 cSt |
| 10 in²/s | 6451.6 cSt |
| 25 in²/s | 16129 cSt |
| 50 in²/s | 32258 cSt |
| 100 in²/s | 64516 cSt |