Convert Square millimetres per second to Square inches per second
Convert Square millimetres per second (mm²/s) to Square inches per second (in²/s) instantly and accurately.
Conversion Formula
in²/s = mm²/s × 0.0015500031
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 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
| Square millimetres per second (mm²/s) | Square inches per second (in²/s) |
|---|---|
| 1 mm²/s | 0.00155 in²/s |
| 2 mm²/s | 0.00310001 in²/s |
| 5 mm²/s | 0.00775002 in²/s |
| 10 mm²/s | 0.0155 in²/s |
| 25 mm²/s | 0.0387501 in²/s |
| 50 mm²/s | 0.0775002 in²/s |
| 100 mm²/s | 0.155 in²/s |