A new engineering model for the superplastic forming of domes has been developed. Unlike the well-known Jovane's model [1], it allows one to predict the thickness distribution of the domes. The approach involved permits the calculation of the pressure-time cycle and the thickness distribution without complicated numerical calculations. The superplastic bulge forming of domes was used as a test case. In spite of the simplicity of the model suggested, good agreement between the theoretical predictions and experimental data and results known from the literature was obtained.