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Fire Emblem: Sword of Seals
Calculations

Credits: Pegasus Knight, Nitrodon (Devil Axe backfire rate)

Note: All final decimals are rounded down

Weapon triangle

The physical weapon triangle is: Sword > Axe > Lance > Sword
The magical weapon triangle is: Anima > Light > Dark > Anima
(">" means is "good against")

Double Attack

Property
 Calculations
Attack Speed
  = Speed - (Weapon Weight - Constitution, take as 0 if negative) [Minimum is 0]

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

Damage

Property Type Calculations
Attack


 Physical
  = Strength + [(Weapon might + Weapon triangle bonus) x Effective bonus] + Support bonus
Magical
  = Magic + [(Weapon might + Weapon triangle bonus) x Effective bonus] + Support bonus
Defence

 Physical
  = Defence + Support bonus + Terrain bonus
Magical
  = Resistance + Support bonus + Terrain bonus
Damage
  = (Attack - enemy Defence) x Critical bonus

Weapon triangle bonus: +1 if weapon is good against enemy's weapon, -1 if bad against enemy's weapon

Effective bonus: 3 if weapon is effective against enemy, 1 if not
Critical bonus: 3 if critical is successful, 1 if not

Accuracy

Property
 Calculations
Accuracy  = Weapon Hit + (Skill x 2) + (Luck / 2) + Support bonus + Weapon triangle bonus
Avoid  = (Attack Speed x 2) + Luck + Support bonus + Terrain bonus
Staff accuracy
  = 30 + [(Magic - enemy Resistance) x 6] + Skill - (distance from enemy)
Battle accuracy  = Accuracy - enemy's Avoid

Weapon triangle bonus: +10 if weapon is good against enemy's weapon, -10 if bad against enemy's weapon

Critical

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

Critical bonus: 30 if user is a Swordmaster or Berserker

Note: Critical rate is 0 if user attacks with a Light Brand (indirect)

Curse

Property
 Calculations
Backfire rate  = (21 - Level) % [minimum is 1]

Note: Applies for Devil Axe

Rescue

Property
 Calculations
Foot unit Aid
  = Constitution - 1
Mounted unit Aid (male)
  = 25 - Constitution
Mounted unit Aid (female)  = 20 - Constitution

Rescue if: Aid >= ally's Constitution

Note: All non-playable enemy characters use the male mounted Aid formula.

Stealing

Only items can be stolen

Weapon Ranks

Weapon Rank
 Required WEx
 Total WEx
- to E
 1
 1
E to D
 50
 51
D to C
 50
 101
C to B
 50
 151
B to A
 50
 201
A to S
 50
 251

Note 1: All weapons give 1 Weapon EXP per hit.
Note 2: Fatal hits give 2 Weapon EXP instead of 1.
Note 3: Weapon EXP is gained even if no damage is done or the attack misses.
Note 4: No Weapon EXP is obtained when using the Light Brand (indirect).
Note 5: The maximum Weapon Rank for non-promoted characters is A (Weapon EXP towards an S Rank cannot be obtained). 

Experience
Property
 Calculation
Experience from doing damage  = [31 + (enemy's Level + enemy's Class bonus A) - (Level + Class bonus A)] / Class power
Experience from doing no damage
  = 1
Experience from defeating (base)
  = [(enemy's Level x enemy's Class power) + enemy's Class bonus B] - [(Level x Class power) + Class bonus B]
Experience from defeating enemy  = Experience from doing damage + (Experience from defeating (base) + 20 + Boss bonus + Thief bonus, take as 0 if negative)

Class power: 1 for Childs, Civilians, Transporter, 2 for Soldiers, Troubadours, Bards, Mamkutes (F), Priests, Thieves, Divine Dragons and Dancers, 4 for Paladins (F), 5 for Demon Dragons, Fire Dragons and Kings, 3 for everything else.
Class bonus A: 0 for non-promoted classes, 20 for promoted classes.
Class bonus B: 0 for non-promoted classes, 40 for Bishops and Valkyrias, 60 for all other promoted classes.
Boss bonus: 40 if enemy is a boss, 0 if not.
Thief bonus: 20 if enemy is a Thief, 0 if not.

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