Histogram Express

Histogram Express is a Microsoft Excel add-in that creates fast, high-quality histograms from your Excel data. Histogram Express is extremely flexible, including a lot of features and options that provide you full control over the final output. With Histogram Express, you can create both bar histograms and line histograms (frequency polygons, ogives). Also, you can adjust the number of bins after building the histogram.

This is very useful when you want to find the most appropriate number of intervals for your histogram. You can study various histogram shapes and save the one that seems to best represent the distribution of your data.