Reynolds Number Calculator Absolute Viscosity density (kg/m3, lbm/ft3) velocity (m/s, ft/s) hydr. diameter (m, ft) absolute (dynamic) viscosity (N.s/m2, lbm/s.ft) Kinematic Viscosity velocity (m/s, ft/s) hydr. diameter (m, ft) kin. visc. (m2/s, ft2/s))