Viscosity Converter

Dynamic viscosity: cP, cSt (needs fluid density), approximate Saybolt Universal seconds, and rough Engler degrees. Correlations are approximate.

Everything resolves to pascal-seconds, and the density field is the hinge that decides whether it is needed. Centipoise is simply a thousandth of a Pa·s, a dynamic viscosity that stands on its own, so while you are entering cP the density box does nothing at all to the cP and Pa·s rows — it moves only the centistokes column. Kinematic units invert that. Centistokes, Saybolt seconds and Engler degrees all describe how readily a fluid flows under its own weight, which means they carry density inside them and have to be multiplied by it to become dynamic; the 1000 kg/m³ default stands for water, and raising it pushes the centistokes reading down for the same underlying viscosity. Saybolt figures go through cSt = 0.226t − 195/t, the ASTM short-range correlation intended for efflux times between roughly 32 and 100 seconds at 100 °F, and this engine applies it outside that window too rather than switching to the longer-time constants. Engler degrees use the comparable 7.31E − 6.31/E approximation. The absence that swamps all of this is temperature. Viscosity depends on it far more strongly than on any unit choice — water alone runs from about 1.79 cP at freezing to 0.28 cP at boiling — and there is no temperature field on the page, so every figure is implicitly at whatever condition your source measurement was taken. Shear rate is missing too, so paint, blood and ketchup, which thin as they are stirred, have no single viscosity to convert.