Understanding Armor Class
Armor Class is the number an enemy attack must meet or beat. It is not a pool of health. It is a target value. Higher AC means fewer weapon hits, claws, bites, and spell attacks connect. A low number can still work, but the character will rely more on distance, cover, resistance, or healing.
Why Inputs Matter
DND 5E uses several AC rules. Some armor adds your full Dexterity modifier. Medium armor limits that bonus to two. Heavy armor ignores Dexterity. Shields add a flat bonus when carried and used. Class features can replace armor math. A barbarian can use Constitution. A monk can use Wisdom. Mage Armor and natural armor set different starting numbers.
Stacking Bonuses
The calculator separates base AC from extra bonuses. It then adds shields, magic armor, protection items, spells, cover, and custom modifiers. This helps you see every source. It also avoids hidden mistakes. A shield spell bonus is temporary. Half cover is situational. A ring of protection is usually constant while worn.
Advanced Use
Use this tool before encounters, character audits, or homebrew testing. Compare plate armor with a shield. Compare Mage Armor with Bracers of Defense. Test how Haste changes survival for one fight. Enter penalties when a condition, curse, or house rule lowers AC. Export the result when you want a quick record for a sheet, note, or table handout.
Reading the Result
The final AC is only one part of defense. Saving throws, hit points, movement, reactions, and tactics still matter. A very high AC can fail against saving throw spells. A moderate AC can be safe behind cover. Review the warning notes when a feature has limits. Then choose the combination that matches your character, item list, and current scene.
Common Table Checks
Always confirm what the character is wearing now. A shield must be held. Armor may need proficiency. Stealth disadvantage can matter during scouting. Strength requirements may reduce speed for some heavy armor. Temporary magic should be removed after its duration ends. Cover should change when the creature moves. For best results, save one export for normal travel and another for combat buffs. This creates a clean comparison for players and game masters each round.