maratoolHow to convert centistokes to m²/s (kinematic viscosity)
Type a kinematic viscosity — read m²/s, St, cSt, mm²/s, or ft²/s instantly.
Lubricant grades quote cSt, SI formulas want m²/s, and legacy US data uses ft²/s. The Kinematic Viscosity Converter moves between them with exact factors.
How it works
- Pick units — "Centistokes (cSt)" to "Square meter per second (m²/s)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Kinematic viscosity conversion factors
Every unit converts through the square meter per second (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many square meter per seconds |
|---|---|
| Square meter per second (m²/s) | 1 |
| Square centimeter per second / Stokes (St) | 0.0001 |
| Centistokes (cSt) | 1.0000 × 10^-6 |
| Square millimeter per second (mm²/s) | 1.0000 × 10^-6 |
| Square foot per second (ft²/s) | 0.09290304 |
| Square inch per second (in²/s) | 0.00064516 |
When you need it
ISO VG numbers are the mid-point cSt at 40 °C — ISO VG 46 means 46 cSt = 4.6 × 10⁻⁵ m²/s. Water sits near 1 cSt at 20 °C; SAE 30 engine oil is roughly 100 cSt at 40 °C.
Sources & methodology
Conversion factors follow NIST Special Publication 811; exact-by-definition factors are marked in the tool itself. All math runs client-side in your browser — nothing is uploaded.
More conversion guides
- How to convert centipoise to Pa·s (dynamic viscosity)
- How to convert GPM to L/min and CFM to m³/h
- How to convert density between kg/m³, g/cm³, and lb/ft³
Or browse everything at once in the new unit & sizing converters roundup.