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One of the most important parameters in designing grout mixtures is to determine type and size of the existing particles in the grout admixtures which are directly related to the size, shape and geometric configurations of the soil particles to be grouted. Generally, the ratio of the smallest soil particles to the largest cement particles in the grout admixtures is defined as the groutability ratio. To date, groutability ratios are mainly determined via experimental results and/or empirical equations. However, in order to properly analyze soil groutability, it is important to develop analytical methods to account for the most effective and determinative parameters. In this paper, a new mathematical approach is developed to compute the effective voids diameter and also to determine the smallest effective diameter of voids that may exist among soil particles which can be used to classify the quality of grouting performance.