Accuracy represents the probability of an attacking unit landing a successful hit on a defending unit. It is a percentage that is influenced by various factors, such as the attacking unit's hit rate or the defending unit's evade.
Overview 
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Accuracy percentages are determined by various internal (e.g., hit rate, evade) and external factors (e.g., weapon triangle effects) that influence a combative interaction between opposing units or groups of units. The sum of all applicable factors yield a value that is then converted into a percentage. This percentage—which is depicted as the battle accuracy—is then used as a threshold value for a successful hit or miss in a random number generator system.
In almost every Fire Emblem game, the accuracy sums below 0 are set to 0 and accuracy sums exceeding 100 are set to 100. In Fire Emblem: Thracia 776, the accuracy sums below 1 are set to 1 and accuracy sums exceeding 99 are set to 99.
In Fire Emblem: Shadow Dragon and the Blade of Light Edit
Overall accuracy
Accuracy = (HRatk) - (Evddfn)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade
In Fire Emblem Gaiden Edit
Overall accuracy
Accuracy = (HRatk) - (Evddfn)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade
In Fire Emblem: Mystery of the Emblem Edit
Overall accuracy
Accuracy = (HRatk) - (Evddfn)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade
In Fire Emblem: Genealogy of the Holy War Edit
Overall accuracy
Accuracy = (HRatk) - (Evddfn)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade
In Fire Emblem: Thracia 776 Edit
Physical and magical accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
Staff accuracy
Accuracy = (Sklcst ×4) + (Hitcst)
Sklcst = Casting unit's skill Hitcst = Casting unit's staff accuracy
In Fire Emblem: The Binding Blade Edit
Physical and magical accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
Staff accuracy
Accuracy = [(Magcst - Resdfn) ×6] + (Sklcst) + 30 - (Dist)
Magcst = Casting unit's magic Resdfn = Defending unit's resistance Skl = Casting unit's skill Dist = Distance between caster and defender
In Fire Emblem: The Blazing Blade Edit
Physical and magical accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
Staff accuracy
Accuracy = (HRcst) - (Evddfn)
HRcst = Casting unit's hit rate Evddfn = Defending unit's evade
In Fire Emblem: The Sacred Stones Edit
Physical and magical accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
Staff accuracy
Accuracy = (HRcst) - (Evddfn)
HRcst = Casting unit's hit rate Evddfn = Defending unit's evade
In Fire Emblem: Path of Radiance Edit
Physical and magical accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
Staff accuracy
Accuracy = [(Magcst - Resdfn) ×5] + (Sklcst) + 30 - (Dist ×2)
Magcst = Casting unit's magic Resdfn = Defending unit's resistance Skl = Casting unit's skill Dist = Distance between caster and defender
In Fire Emblem: Radiant Dawn Edit
Physical and magical accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
※ On Hard Mode, W△ = 0 regardless of weapon dis/advantage
Staff accuracy
Accuracy = [(Magcst - Resdfn) ×5] + (Sklcst) + 30 - (Dist ×2)
Magcst = Casting unit's magic Resdfn = Defending unit's resistance Skl = Casting unit's skill Dist = Distance between caster and defender
In Fire Emblem: Shadow Dragon Edit
Overall accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
In Fire Emblem: New Mystery of the Emblem Edit
Overall accuracy
Accuracy = (HRatk) - (Evddfn) + (W△)
HRatk = Attacking unit's hit rate Evddfn = Defending unit's evade W△ = Weapon triangle effects
In Fire Emblem Awakening Edit
Overall accuracy
Accuracy = (HRatk) + (HSppatk) - (Evddfn) - (ESppdfn) - (Terrdfn) + (SpAsys) + (W△)
HRatk = Attacking unit's hit rate HSppatk = Attacking unit's hit support bonus from adjacent and paired allies Evddfn = Defending unit's evade ESppdfn = Defending unit's evade support bonus from adjacent and paired allies Terrdfn = Modifier from defending unit's terrain tile SpAsys = Modifiers from any skills that influence either part of the system W△ = Weapon triangle effects
In Fire Emblem Fates Edit
Physical and magical accuracy
Accuracy = (HRatk) + (Ineffatk) + (HSppatk) - (Evddfn) - (ESppdfn) - (Terrdfn) + (SpAsys) + (W△)
HRatk = Attacking unit's hit rate Ineff = -10 if attacker's weapon is ineffective vs. defending unit HSppatk = Attacking unit's hit support bonus from adjacent and paired allies Evddfn = Defending unit's evade ESppdfn = Defending unit's evade support bonus from adjacent and paired allies Terrdfn = Modifier from defending unit's terrain tile SpAsys = Modifiers from any skills that influence either part of the system W△ = Weapon triangle effects
Staff/rod accuracy
Accuracy = (HRcst) - (Evddfn) - (Terrdfn ×0.5)
HRatk = Casting unit's hit rate Evddfn = Defending unit's evade Terrdfn = Modifier from defending unit's terrain tile
