Armor Class 5e Calculator
Calculate your D&D 5th Edition Armor Class (AC) based on gear, stats, and class features.
Select how your character calculates their base protection.
Leather (11), Studded (12), Breastplate (14), Plate (18), etc.
Standard shield is +2.
+1 Armor, Rings of Protection, etc.
Defense Style (+1), Dual Wielder (+1), etc.
13
Hit Probability vs. Attack Bonus
Likelihood of a creature hitting you based on your current AC.
● Critical Hit (always 5%)
What is an Armor Class 5e Calculator?
An armor class 5e calculator is a specialized tool used by players and Dungeon Masters in Dungeons & Dragons 5th Edition to determine how difficult a character is to hit in combat. Your Armor Class (AC) represents a combination of physical protection, agility, and magical defenses. Utilizing an armor class 5e calculator ensures that you account for every modifier, from your Dexterity score to complex class features like a Barbarian’s Unarmored Defense or a Monk’s enlightened reflexes.
Many new players mistakenly believe that armor is the only factor in AC. However, the armor class 5e calculator demonstrates that stats and feats play a massive role. Whether you are wearing full plate or just your birthday suit, knowing your exact AC is critical for survival in the dungeons of the Sword Coast.
Armor Class 5e Calculator Formula and Mathematical Explanation
The math behind an armor class 5e calculator depends entirely on your character’s equipment and class. Here is the step-by-step derivation for the most common configurations:
- Unarmored: 10 + Dexterity Modifier
- Light Armor: Armor Base AC + Dexterity Modifier
- Medium Armor: Armor Base AC + Dexterity Modifier (capped at +2)
- Heavy Armor: Armor Base AC (No Dexterity modifier applied)
- Unarmored Defense (Barbarian): 10 + Dex Modifier + Con Modifier
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Base AC | Static value provided by the armor type | Integer | 10 to 18 |
| Dex Modifier | (Dex Score – 10) / 2 (rounded down) | Integer | -1 to +5 |
| Shield Bonus | Additional protection from a held shield | Integer | +2 |
| Magic Bonus | Enhancement bonus from +1/+2/+3 items | Integer | 0 to +3 |
Practical Examples (Real-World Use Cases)
Example 1: The High-Agility Rogue
A Rogue with a Dexterity of 18 (+4 mod) wearing Studded Leather (Base 12). Using the armor class 5e calculator, we apply the Light Armor formula: 12 (Base) + 4 (Dex) = 16 AC. If they use a Cunning Action to hide, their AC remains 16, but they are harder to target.
Example 2: The Tanky Paladin
A Paladin wearing Plate Armor (Base 18) with a Shield (+2) and the Defense Fighting Style (+1). Despite having a Dexterity of 10 (+0), the armor class 5e calculator calculates: 18 (Plate) + 2 (Shield) + 1 (Style) = 21 AC. They are a literal walking tank.
How to Use This Armor Class 5e Calculator
- Select Calculation Basis: Choose if you are wearing standard armor or using a class feature like Unarmored Defense.
- Input Stats: Enter your Dexterity, and if applicable, your Constitution or Wisdom scores.
- Set Base Armor: Enter the numeric base value of your specific armor (e.g., 12 for Studded Leather).
- Add Modifiers: Input any bonuses from shields, magic items (like a Cloak of Protection), or feats.
- Review Results: The armor class 5e calculator updates instantly to show your total AC and a breakdown of the math.
Key Factors That Affect Armor Class 5e Calculator Results
1. Armor Type: Heavy armor provides high protection but ignores your agility, while light armor relies heavily on it.
2. Dexterity Caps: Medium armor limits your Dex bonus to +2, which is a vital consideration for the armor class 5e calculator logic.
3. Shields: Carrying a shield typically adds +2 to your AC, but prevents the use of two-handed weapons.
4. Magic Items: Items like Bracers of Defense or a Ring of Protection provide flat bonuses that stack with most AC calculations.
5. Spells: Temporary buffs like *Shield of Faith* (+2) or the *Shield* spell (+5 as a reaction) significantly alter your effective AC during combat.
6. Cover: Half cover adds +2 and three-quarters cover adds +5 to your AC, representing environmental protection.
Frequently Asked Questions (FAQ)
Does Mage Armor stack with Unarmored Defense?
No. Both Mage Armor and Unarmored Defense provide a new way to calculate your base AC. You must choose one; you cannot combine them in the armor class 5e calculator.
Can I use a shield with a Monk’s Unarmored Defense?
No. The Monk’s feature specifically states you gain the benefit while not wearing armor and not wielding a shield.
What is the maximum AC possible in 5e?
Theoretically, with legendary items, high stats, and spells, a character can reach an AC over 30, though 18-22 is standard for high-level play.
Does negative Dexterity reduce my AC in Heavy Armor?
No. In 5e, heavy armor ignores your Dexterity modifier entirely, whether it is positive or negative.
How does Natural Armor work with standard armor?
Natural Armor (like a Lizardfolk’s scales) is usually a base calculation (13 + Dex). You use either your Natural Armor or manufactured armor, whichever is higher.
Is there a limit to the magic bonus on armor?
Standard 5e items go up to +3, but homebrew or specific artifacts might exceed this.
Do bonuses from two shields stack?
No. You can only benefit from one shield at a time in D&D 5e.
How does the ‘Defense’ Fighting Style work?
It provides a +1 bonus to AC only while you are wearing armor. It does not work with unarmored defense.
Related Tools and Internal Resources
- D&D Stat Calculator – Optimize your ability scores for maximum defense.
- Hit Point Calculator – Calculate your health alongside your armor class 5e calculator results.
- Initiative Tracker – See how your Dexterity affects your turn order.
- Spell Save DC Calculator – Determine how hard it is for enemies to resist your magic.
- Encumbrance Calculator – Check if your heavy armor is making you too heavy.
- CR Calculator – See what monsters can actually hit your high AC.