Present study determines optimum geometry for target fluidic flowmeter capable to function at small Reynolds numbers (<300). Using fluent code solver, numerical studies were carried out for gasoil measurements at various geometries and Reynolds numbers. Computational technique for unsteady incompressible viscous flow applicable to two dimensional flow geometries is presented. Effects of nozzle exit-target distance (Xt) and target width (Wt) were studied to determine optimum geometry. Flow characteristics and oscillation mechanism were investilated for a flowmeter.