The Bootstrap method, which is used widely in statistics, is a very powerful method that can be applied to the analysis of particle size distribution. For a number based measurement, this method can estimate the statistic uncertainty or confidence interval for any statistical quantities of interest from the distribution, with very simple protocol and without any parametric assumptions. This paper gives a demonstration to introduce the method to the community of particle size analysis. (C) 2018 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.