The finalized ranking relies on over 50 factors to determine a given nation's Power Index ("PwrIndx") score. This allows smaller, though more technologically-advanced, nations to compete with larger, lesser-developed ones. Modifiers in the form of bonuses and penalties are added to refine the list. Some things to observe in regards to the finalized ranking:
• Ranking does not simply rely on the total number of weapons available to any one country but rather focuses on weapon diversity within the number totals to provide a better balance of firepower available (i.e. fielding 100 minesweepers does not equal the strategic and tactical value of fielding 10 aircraft carriers).
• Nuclear stockpiles are NOT taken into account but recognized / suspected nuclear powers receive a bonus.
• Geographical factors, logistical flexibility, natural resources and local industry influence the final ranking.
• Available manpower is a key consideration; nations with large populations tend to rank higher.
• Land-locked nations are NOT penalized for lack of a navy; naval powers ARE penalized for lack of diversity in available assets.
• NATO allies receive a slight bonus due to the theoretical sharing of resources.
• Current political / military leadership is NOT taken into account.
As of 4/1/2016 there are a total of (126) countries included in the GFP database.
Sources: CIA.gov, CIA World Factbook, wikipedia.com, public domain print and media sources and user contributions. Some values may be estimated when official sources are lacking.