Formulas

Please note, a lot of these are old formulas, and need to be updated. This list does not include every formula either.

Earth is a game of numbers and formulas. So here they are:

Calculating	Formula
Per Capita Income (PCI)	22.5 * (1 - Taxrate) * (1 + (Networth/Land)/90000) * (1 + 2 * Ent/Land) BusTech * GvtPCIBonus
Revenue	PCI * Pop * Taxrate
Construction Cost	3 * Land + 1500
Destruction Cost	0.2 * (3 * Land + 1500)
Oil Consumption	Oil is consumed at a rate of 1 Barrel for 25 Military Units (only applies to Troops, Jets and Tanks when attacking).
Buildings Per Turn	(CS/4 + 5) * GvtContrBonus
Military Upkeep	Troops Upkeep: Troops * .11 * MilTech% * (1 + Networth/40000000) * GvtBonus * Constant Jets Upkeep: Jets * .14 * MilTech% * (1 + Networth/40000000) * GvtBonus * Constant Turrets Upkeep: Turrets * .18 * MilTech% * (1 + Networth/40000000) * GvtBonus * Constant Tanks Upkeep: Tanks * .57 * MilTech% * (1 + Networth/40000000) * GvtBonus * Constant Spies Upkeep: Spies * 1 * MilTech% * (1 + Networth/40000000) * GvtBonus * Constant Constant = If MilBases/Land < .295 Constant = 1 - 1.3*(MilBases/Land) Else (that is, if the number of MilBases built is more than 29.5% of your land) Constant = 0.61
Alliance Costs	Defensive Allies: DefAllies * Networth * .002 (0.2% of NW each) Offensive Allies: OffAllies * Networth * .002 (0.2% of NW each) Intelligence Allies: IntelAllies * Networth * .0015 (0.15% of NW each) Research Allies: ResAllies * Networth * .0015 (0.15% of NW each) Trade Pacts: TradePacts * Networth * .0005 (0.05% of NW each) GDI Costs (non-Theocracy): Land * 4 GDI Costs (Theocracy): Land * 8 Declare War Costs: Land * 10
GDI Penalty	Because of the defensive nature of the alliance, one side effect of GDI is 10% lower gains from your attacks.
Land Upkeep	If land is less than 1500A: Land Upkeep = Land^2 * 7/1500 + Land*3 If land is more than 1500A: Land Upkeep = Land * 10 Note that when Land = 1500, both formulas give the same upkeep.
Total Expense	Military Upkeep Costs + Alliance Upkeep Costs + Land Upkeep Costs
Networth	Troops*0.5+Jets*0.6+Turrets*0.6+Tanks*2+Spies*1+Tech*2+Land*45+Buildings*35+Money/20000+Food/1000+Missles*2500+Pop/6+Oil/100

Note:  A good player does not have to know all the formulas.