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I'm using ArcMap 10.4.1 and I have a map showing points on a map.

Each point represents a measurement of a specific radio frequency and has an attribute of signal strength.

The legend displays discrete bins of data within a range of possible radio frequency values. I want to display the percentage of total points in each bin.

When I use the Legend Properties I'm able to display the count of points in each bin (checked 'show feature count' box in image below), but not the percentage.

Legend Properties This displays the count (in parenthesis) in each bin like in the map below:

enter image description here

How can I add percentage instead of count to my legend?

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For something dynamic I think you will need to find/submit an ArcGIS Idea.

At the moment there are a number of ArcGIS Ideas that are in the same vicinity but they all seem to be more focussed on what appears on the Symbology tab of the Layer Properties rather than what appears in a Legend Element of a Layout (even though the two would be quite related).

You could do something manual using ArcPy to draw graphics and text to look like a legend element but that would be non-trivial and will need to be a new question accompanied by code to illustrate what you have tried.

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    Rather than creating text elements, you could try modifying the labels using UniqueValuesSymbology. Also non-trivial as you'll have to count the values for each class and manually calculate the percentage. It also won't be dynamic. – Fezter Nov 21 '16 at 22:54
  • Good idea @Fezter – PolyGeo Nov 21 '16 at 22:58

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