Item Cap Formulas
Item Stat cap = Level * 1.5 (Eg; 50 *1.5 = 75 item cap)
Item Hit point cap = Level * 4 (Eg; 50 * 4 = 200 hit points from items)
Item Resists cap = (Level / 2)+1 (Eg: (50/2)+1 = 26% resist cap from items)
Item SKill Cap = (Level/5)+1 (Eg: (50/5)+1 = 11 skill bonus cap from items)
Buff Cap Formulas
Spec Stat Buffs (Str/con, dex/qui, etc) = Level*1.5
Base Stat Buffs = Level
Resist Buffs = (Level/2)-1 (Eg: (50/2)-1=24 resists from buffs)
Other Formula's
DPS of Weapon is good for Level - (DPS-1.2)/.3 (eg: (16.2-1.2)/.3=50)
DPS for your level is - (Level+4)*.3 OR (Level*.3)+1.2 (both give same result)
Armor Factor cap = Level*2
Stat Formulas
Shield = base 5% + .5% per spec point. Then modified by dex (.1% per point of dex above 60 and below 300?). Further modified by shield quality, condition, bonus and shield level

The Damage Formula is: 

Damage = WeapDmg (which is a possibly capped weapon DPS) * Delay * Quality * Condition * (WeapSkill / Target's AF) 

The AF of your target is: 

Effective AF = Listed AF * Quality * (1 + (absorb * quality)) 

For total AF you multiply the AF formulae results by 6.(assuming all peices are same AF and quality) 

Effective AF = (Listed AF * Quality * (1 + (absorb * quality))) * 6 

Effective AF = (102 * .99 * (1 + (.27 * .99))) * 6 

Effective AF = (102 * .99 * (1 + (.26))) * 6 

Effective AF = (102 * .99 * 1.26) * 6 

Effective AF = (127) * 6 

Effective AF = 762 
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Damage = WeapDmg (which is a possibly capped weapon DPS) * Delay * Quality * Condition * (WeapSkill / Target's AF) 

Damage = 16.5 * 3.5 * .99 * .99 * (1600 / 762) 

Damage = 16.5 * 3.5 * .99 * .99 * 2 

Damage = 113