A structure of jet-swirl atomizers has been shown, parameters of the atomized liquid jet have been characterized and a way of determination of the discharge coefficient mu and the spray angle cp of this type of atomizers have been presented for inviscid liquid on the assumption of the hyperbolic distribution of the peripheral velocity in the atomizer discharge orifice. The method of calculation of all atomizers generally consists in analytical determination of these two quantities. An influence of viscosity has been taken into account by introducing reduced pressure losses in the atomizer.