# How to calculate sluster size distribution in gromcs?

**URL:** https://gromacs.bioexcel.eu/t/how-to-calculate-sluster-size-distribution-in-gromcs/11508
**Category:** User discussions
**Created:** [February 10, 2025, 3:13pm UTC](https://gromacs.bioexcel.eu/t/how-to-calculate-sluster-size-distribution-in-gromcs/11508 "2025-02-10T15:13:31Z")
**Posts on this page:** 1
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### Author: ![mj.rezayani](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/mj.rezayani/32/3918_2.png) [@mj.rezayani](https://gromacs.bioexcel.eu/u/mj.rezayani)
#### Post date: [February 10, 2025, 3:13pm UTC](https://gromacs.bioexcel.eu/t/how-to-calculate-sluster-size-distribution-in-gromcs/11508/1 "2025-02-10T15:13:31Z")

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Dear GMX users,

There are a several water/zeolite systems with different water loadings. I want to study the effect of water loading on cluster formation (Number of clusters, …). However, for a single system, I would like to obtain a plot of cluster size distribution. I mean I would like to know the probability of a cluster size of (for example, 10 water molecules). There is a histogram as an output of `gmx clustsize` but it is not what I need because it just shows a simple distribution of cluster size of 1.

I need a distribution of different sizes. How can I get it?

Thanks for your help