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Fire Emblem: Path of Radiance
Calculations

Credits: Pegasus Knight, Wonder Egg

Notes: Any fractions are omitted

Double attack

Property
Calculations
Attack Speed  = Speed - (Weapon Weight - Strength, take as 0 if negative)

Double attack if: (Attack Speed - enemy's Attack Speed) >= 4

Damage

Property
Calculations
Physical damage  = Strength + [(Weapon Might + Weapon triangle bonus) x Effective coefficient] + Support bonus
Physical defence  = Defence + Support bonus + Terrain Bonus
Magical damage  = Magic + [(Weapon Might + Weapon triangle bonus) x Effective coefficient] + Support bonus
Magical defence  = Resistance + Barrier/Pure Water bonus + Support bonus + Terrain bonus
Damage  = [(Physical damage - enemy's Physical defence) or (Magical damage - enemy's Magical defence)] x Critical coefficient

Weapon triangle bonus: +1 if weapon is good against enemy's weapon, -1 if bad against enemy's weapon
Physical weapon triangle: Swords > Axes > Lances > Swords
Magical weapon triangle: Fire > Wind > Thunder
(">" means is "strong against")

Effective coefficient: 2 if weapon is effective against enemy, 1 if not
Support bonus: Please view Support bonus page
Terrain bonus: Please view Terrain bonus page
Critical bonus: 3 if critical is successful, 1 if not

Accuracy

Property
Calculations
Accuracy  = Weapon Hit + (Skill x 2) + Luck + Biorhythm bonus + Weapon triangle bonus + Support bonus
Avoid  = (Attack Speed x 2) + Luck + Biorhythm bonus + Support bonus + Terrain bonus [lowest value is 0]
Battle accuracy  = Accuracy - enemy's Avoid [lowest value is 0, highest value is 100]
Staff accuracy  = {30 + [(Magic - enemy's Resistance) x 5] + Skill} - (Distance between units x 2)

Weapon triangle bonus: +10 if weapon is good against enemy's weapon, -10 if bad against enemy's weapon
Biorhythm bonus: +5 if arrow is pointing up, -5 if arrow is pointing down (+/- 2 if user has Serenity, +/- 10 if user has Tempest)

Critical

Property
Calculations
Critical rate  = Weapon Critical + (Skill / 2) + Support bonus + Critical bonus
Dodge  = Luck + Support bonus
Battle critical rate  = Critical rate - enemy's Dodge

Critical bonus: 15 if user is a Swordmaster, Berserker or Sniper

Note 1: If certain units are adjacent to another unit, they can reduce the enemy's Critical rate to 0.
Note 2: Certain weapons can reduce the enemy's Critical rate to 0. The extra critical from Wrath seems to bypass this.

Rescue and Shove

Rescue if: (Weight - other unit's Weight) >= 2
Shove if: (other unit's Weight - Weight) >= 2

Note: Only foot units can Shove

Experience

Property
Calculation
Power  = Level + Class bonus
Battle Exp base  = (21 + [enemy's Power - Power]) / 2 + Easy mode bonus
Experience from doing no damage  = 1
Experience from damaging enemy  = Battle Exp base x Skill coefficient
Experience from defeating enemy  = (Battle Exp base + [enemy's Power - Power] + Mode bonus + Boss bonus + Thief bonus) x Skill coefficient

Class bonus: 20 if user is promoted (some classes like Princess Crimea count as promoted), 0 if not
Easy mode bonus: 5 if Easy mode
Skill coefficient: 2 if user has Paragon, 0.7 if user has Blossom, 1 if user has neither
Mode bonus: 30 for Easy mode, 20 for Normal mode, 15 for Hard mode, 10 for Maniac mode
Boss bonus: 30 if enemy is a boss, 40 if enemy is a boss in Easy mode
Thief bonus: 20 if enemy has the Steal skill

Stealing

Steal if: Attack Speed > enemy's Attack Speed and Strength > enemy's item Weight

Note 1: User must have the Steal skill to steal items (obviously)
Note 2: Equipped weapons cannot be stolen

Weapon Ranks

Weapon Rank
Required WEx
Total WEx
- to E
1
1
E to D
30
31
D to C
40
71
C to B
50
121
B to A
60
181
A to S
70
251

Note 1: Weapon EXP is obtained even if no damage is done or the attack misses
Note 2: Characters can only have one S Rank
Note 3: Non-promoted characters can reach a maximum B Rank (Weapon EXP towards an A Rank cannot be obtained)
Note 4: Sages can reach a maximum B Rank in Staves

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