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Four different algorithms were used to evaluate the numerical values of particle size of unground RHA with a view to determining the most suitable algorithm. The experimental design used was a 5x4 two-factor in complete block randomized design (CBRD). Five RHA types form the five levels of one factor while the four algorithms form the block or the second factor at four levels. The particle size distribution of each sample was generated and used for the analysis by each of the four algorithms. The four algorithms used were Henderson and Perry’s technique, British Standard fitted with quadratic equation, British Standard fitted with logarithmic function and ASABE Standard. The raw particle size data, the coefficients of variation of various replications and coefficient of determinations were each subjected to ANOVA and separation of means at α = 0.05. It was found that Henderson and Perry’s technique clearly gave the highest values of particle size while British Standard fitted with quadratic curve was most suitable on account of low coefficient of variation of the replicate values and high coefficient of determination of the trendlines fitted. Henderson and Perry’s technique is to be used with caution in situations where the other algorithms could not easily detect treatment effects.

Suitability of techniques for analyzing particle size of rice husk ash (RHA) from sieve analysis data