Histogram Bin Width Calculation

Jul 11, 2007

I am looking for an formula to calculate the bin width for a histogram chart.

I am thinking of creating 50 bins for the chart. The range (max - min) of the data can be from 10 to 5,000,000.

A straighforward formula will be (max - min)/ 50. But I don't want decimal point in the bin numbers.

I am thinking of using Floor/Ceiling function, to round the bin-width to whole numbers, but 10/50, 100/50, 1000/50,..., 1000000/50 all need to round up/down to different scales! for example, I want 100/50 round to 5, 1000/50 round to 50 etc.....I was wondering is there a formula I can use to calculate the bin-width based on the criteria above or similar?

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