Convert kinematic viscosity accurately between square metres per second, square millimetres per second, stokes, centistokes, and square-foot or square-inch per second units.
Example: a kinematic viscosity of 32 cSt. How many mm²/s is that?
Result32 mm²/s 32 cSt = 32 mm²/s
One-unit equivalent1 cSt = 1 mm²/s A quick way to understand the relationship between the two units.
✓ Conversion factors match data and definitions from the National Institute of Standards and Technology (NIST)
How is the conversion calculated?The value is converted to square metres per second first, the SI unit of kinematic viscosity, then to the requested unit using fixed factors.
This calculation runs in your browser. Your values are not sent to our server.
Enter a kinematic-viscosity value, then choose the current and target units.
Example: 32 cSt equals exactly 32 mm²/s.
The converter uses square metres per second, the SI unit of kinematic viscosity, as its internal reference.
The relationship 1 cSt = 1 mm²/s = 0.000001 m²/s is exact, and 1 St = 0.0001 m²/s exactly.
The ft²/s and in²/s factors are derived from the exact international foot and inch definitions, with display rounding only when the decimal expansion does not terminate.
This is a unit converter only; converting kinematic viscosity to dynamic viscosity requires the material density.
FAQ
Is 1 cSt the same as 1 mm²/s?
Yes. 1 centistoke equals exactly 1 square millimetre per second.
How many m²/s are in 1 St?
1 stoke equals exactly 0.0001 square metre per second.
How many cSt are in 1 St?
1 stoke equals exactly 100 centistokes.
What is the difference between kinematic and dynamic viscosity?
They are different quantities. Kinematic viscosity uses units such as m²/s and cSt, while dynamic viscosity uses Pa·s and cP. Converting between them requires the material density.
Does viscosity change with temperature?
A material’s viscosity can vary with temperature. This page only converts an existing value between units and does not predict temperature effects.