The surface-oil contents of microcapsules with differing oil droplet-to-microcapsule size ratios were estimated based on a two-dimensional percolation model to examine the effects of differences in the ratio distribution. In the model, squares were divided into equal lattices that were sized to obey a log-normal distribution. The surface-oil contents of microcapsules with various volumetric oil fraction and different variances of the ratio were evaluated. The variance in the distribution of the oil droplet-to-microcapsule size ratio had no significant effect on the surface-oil content at any oil fraction in the microcapsules.