This work focused on the time-averaged droplet size distribution in steady-state dropwise condensation. Through theoretical analysis, we derived an expression to describe the droplet size distribution, which is a function of the surface fraction, fractal dimension, and the maximum radius of droplets. Compared with the well-known semi-empirical model by Le Fevre and Rose (1966), the present model has no empirical constant and all parameters in the model have clearly physical meaning. Computer simulations were further conducted for different initial configuration of primary droplets, growth rate of an individual droplet and time step. It was found that the simulation results corresponded well with the available experimental data. The predictions from the semi-empirical model by Le Fevre and Rose and from the present model were also compared with the simulation results and the measured data. A good agreement between them implies that both the two models are valid to be used to describe the time-averaged droplet size distribution under various conditions used in experiments and simulations. (C) 2015 Elsevier Ltd. All rights reserved.