Equations
note: When dividing, round down.
ability modifier = (ability score - 10) / 2
initiative = dex modifier
max hp at level 1 = hit die + con modifier
proficiency bonus = 2 + (level - 1) / 4
_ proficiency =
2 x proficiency bonus if expert in _
proficiency bonus if proficient in _
otherwise 0
skill modifier = corresponding ability modifier + skill proficiency
passive perception = 10 + perception modifier
saving throw modifier = corresponding ability modifier + saving throw proficiency
melee attack bonus = str modifier + weapon proficiency
finesse attack bonus = max(str modifier, dex modifier) + weapon proficiency
ranged attack bonus = dex modifier + weapon proficiency
melee attack damage = str modifier + weapon damage
finesse attack damage = max(str modifier, dex modifier) + weapon damage
ranged attack damage = dex modifier + weapon damage
armor class
if you are not wearing armor, start with 10
otherwise start with the armor class of the armor you're wearing
if you are wearing light armor, add your dex modifier
if you are wearing medium armor, add min(dex modifier, 2)
if you are using a shield, add 2
spell attack bonus = spellcasting ability modifier + proficiency bonus
spell save dc = 8 + spell attack bonus