Some articles that will need to be in, so anyone with info chipping in would be useful.

Cost Calculations
-City Maintenance
-Civic Upkeep
-Unit Support
-Interest

Experience Accumulation Calculation

Religion (Passive) Spread Calculation

Missionary+Spy Success rate Calculation

Culture Flipping Calculation

Trade Route Value+Formation Calculations (which ones form and how much are they worth)

Holy City Selection Calculation