HomeCalculatorsReynolds Number

Reynolds Number

Dimensionless ratio of inertial to viscous forces; the x-axis of every friction-coefficient correlation.

ResistanceHydrodynamics
Reynolds number
1,211,270,770 -
Formula, assumptions, and limits

Typical ship Re sits between 10^8 and 10^9, fully turbulent by a wide margin. ITTC-57 friction line is calibrated to this range.

Symbol legend

SymbolMeaningUnitSource
Ship speedm/sderived from knots
Waterline lengthmhydrostatics
Kinematic viscositym²/sITTC water table