Heatmaps are very handy tool to the analyze and visualize the large multi-dimensional datasets. They are often used with high-throughput gene expression data like microarray as they can help to identify hidden groups among analyzed genes or association between experimental conditions and gene expression patterns. There are several bioinformatics software to generate the heatmaps but what if you can generate heatmap without downloading any additional software or going some server. In this post I will share some tricks to generate beautiful heatmaps using your very own microsoft excel.