Demographics screen

[BigFurryMonster]

EDIT: updated for info gained from CFC
EDIT2: updated Approval Rating formula

This is the way the demographics (in the F11 screen) are calculated. Thanks for helping me out!

• Approval Rating (%)
  Rounddown (50% + ((Number of happy citizens) - (Number of unhappy citizens)) / (Total number of citizens) / 2 * 100%)
  
• Population (# of people)
  Sum(i=1..N) {Pop in City(i)}
  
  Pop in City = {Sum (j=1..(City Size)) {j} + (Food in Storage) / (Storage Size)} * 10000
  
• GNP (millions)
  1 million = 1 Commerce (before corruption)
  
• Mfg. Goods (megatons)
  1 megaton = 1 shield
  
• Land area (square miles)
  100 square miles = 1 territory tile (including sea tiles)
  
• Literacy (%)
  (Citizens who live in a city with a Library + Citizens who live in a city with a University + Citizens who live in a city with a Research Lab) / 3 / (Total Number of Citizens) * 100% + (3% if Literature discovered)
  
  The following wonders count as Library, University and Research Lab: Great Library, Newton's, SETI Program, Theory of Evolution, Cure for Cancer, Internet.
  
  The following small wonders count as half a wonder: Apollo Program, Intelligence Agency.
  
• Disease (%)
  (Number of Floodplains + Jungle in territory) / (Total Number of territory tiles) * 100%
  
• Pollution (tons)
  1 ton = 1 polluted territory tile
  
• Life Expectancy (# of years)
  20 + {(Citizens who live in a city with a Granary + Citizens who live in a city with a Aqueduct + Citizens who live in a city with a Hospital) / 3 / (Total Number of Citizens) * 80}
  
• Family Size (# of children)
  Max {1, (Net Total Food) / (Number of Cities) / 2}
  
• Military Service (# of years)
  (Number of Military Units with Attack > 0) / (Total Number of Citizens) * 10
  
• Annual income (# per capita)
  1 + (Number of available Strategic and Luxury Resource Types) + (1 if you have a trade route)
  
• Productivity (#)
  (Total Shields) - (Total Waste) + (Total Commerce) - (Total Corruption) + (Net Total Food)

[Spiffor]

Land area (square miles) - 100 square miles = 1 tile ?

Yes

GNP : 1 million = 1 commerce (including corruption)

Productivity : apparently, commerce+shields+extra food - corruption - waste.

Approval rating has to do with the # of happy and content people. Here is some data I have gathered :
All content = 50% satisfaction
1 happy, 2 content = 66%
1 happy, 3 content = 62%
2 happy, 2 content = 75%
3 happy, 1 content = 87%
My conclusion is that a X% of happy citizens add X/2 % of satisfaction, while Y% of unhappy citizens substract Y/2 % to satisfaction.
The equation would be : satisfaction = [0.5 + 1/2(happy/total citizens) - 1/2(unhappy/total citizens)] * 100

Family size depends directly of your growth rate, i.e your excess fod. Again, I don't know the formula.

Military service : # of units / # of citizens. 1/1 means 10 years.

[Demerzel]

interesting to see how some are calculated.

[Nor Me]

Yes: How the Demographics works

I find the literacy demograhic useful for telling if civs on other continents have literature when you don't.

[BigFurryMonster]

That helps. CFC is not 100% correct, but I was able to deduce the formulas.

[Blaupanzer]

Good work!

[BigFurryMonster]

Updated Approval Rating formula.

[FrostyBoy]

Thanks, it's actually useful to know how the demographics are really calculated!

[Alex]

aha!

bananas, anyway.

[Brundlefly]

Instead of city-flipping, Civ3 could have workers defect to other civs if the demographics are attractive.