How to make rounded percentages add up to 100%

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There are many ways to do just this, provided you are not concerned about reliance on the original decimal data.

The first and perhaps most popular method would be the Largest Remainder Method

Which is basically:

  1. Rounding everything down
  2. Getting the difference in sum and 100
  3. Distributing the difference by adding 1 to items in decreasing order of their decimal parts

In your case, it would go like this:

13.626332%
47.989636%
 9.596008%
28.788024%

If you take the integer parts, you get

13
47
 9
28

which adds up to 97, and you want to add three more. Now, you look at the decimal parts, which are

.626332%
.989636%
.596008%
.788024%

and take the largest ones until the total reaches 100. So you would get:

14
48
 9
29

Alternatively, you can simply choose to show one decimal place instead of integer values. So the numbers would be 48.3 and 23.9 etc. This would drop the variance from 100 by a lot.

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