Monthly revolt % odds annualized [by AndrewT]

[State Machine]

EDIT: This info is Pre 1.07 and no longer applies.

The revolt % you see on any given province in EU or EU2 is a chance per month for that province to revolt in that month. Here are the chances that a given province will revolt at least once in a year, at a certain monthly revolt %:

[font=courier]
[b]
                           %/year
%/month      %/year    multi revolts[/b] 

   1          11.4           0.6
   2          21.5           2.3
   3          31.6           4.9
   4          38.7           8.1
   5          46.0          11.8
   6          52.4          16.0
   7          58.1          20.3
   8          63.2          24.9
   9          67.8          29.5
  10          71.8          34.1
  11          75.3          35.6
  12          78.4          43.1[/font]

So as you can see if a province has a 5% revolt chance per month, it is nearly 50% likely to revolt at least once in any given year. Each % increase from 1 -> 2 -> 3 is an extra 10% chance per year, quite significant. Above that the increment per monthly revolt % point drops quite a bit; so you can expect a noticeable change if you improve a province from 2% down to 1%, but you might not notice a drop from, say, 10% to 9%.

These numbers also apply to any other monthly % of course.

EDIT: Straybow corrected a typo and added the calculation for having multiple revolts in the same year based on revolt %.