DND Armor Class Calculator

Calculator Form

Character Name

Character Level

AC Method

Armor or Base Rule

Dexterity Score

Constitution Score

Wisdom Score

Custom Base AC

Custom Dexterity Cap

Shield Equipped

Magic Armor Bonus

Magic Shield Bonus

Cover Bonus

Spell Bonus

Class or Feature Bonus

Miscellaneous Bonus

Enemy Attack Bonus

Notes

Example Data Table

Build	Base Method	Dexterity	Shield	Extra Bonus	Final AC
Rogue Scout	Studded Leather	16	No	0	15
Shield Fighter	Chain Mail	12	Yes	1	19
Mage Guard	Mage Armor	16	No	2	18
Barbarian Tank	Unarmored Defense	14	Yes	0	16

Formula Used

The calculator first selects the valid base armor class method. Standard armor uses armor base plus Dexterity modifier. Light armor uses full Dexterity. Medium armor limits Dexterity to plus two. Heavy armor ignores Dexterity. Mage Armor uses thirteen plus Dexterity. Barbarian defense uses ten plus Dexterity plus Constitution. Monk defense uses ten plus Dexterity plus Wisdom.

After the base is found, the calculator adds allowed bonuses. The full formula is:

Final AC = Base AC + Shield Bonus + Magic Armor Bonus + Magic Shield Bonus + Cover Bonus + Spell Bonus + Feature Bonus + Miscellaneous Bonus

The hit chance estimate uses an enemy attack bonus. Natural one is treated as a miss. Natural twenty is treated as a hit.

How to Use This Calculator

Enter your character name and level.
Select the AC method that matches your build.
Choose armor, spell base, natural armor, or custom rule.
Add Dexterity, Constitution, and Wisdom scores.
Select shield use and enter magical bonuses.
Add cover, spell, feature, or table bonuses.
Enter an enemy attack bonus for hit chance estimates.
Press the calculate button and review the result above the form.

Armor Class Planning

Armor Class is a key defense number in fantasy role play. It tells the table how hard a character is to hit. A higher value usually means fewer successful attacks. This calculator helps players test armor, Dexterity, shields, cover, spells, and custom bonuses before a session.

Why Armor Class Matters

Good defense changes tactical choices. A wizard with Mage Armor can survive early fights. A fighter with plate and a shield can guard allies. A rogue may depend on Dexterity and light armor. Small bonuses matter because each point can change many attack rolls over a long adventure.

How This Tool Helps

The form accepts common rules and table adjustments. You can choose a standard armor base. You can add Dexterity limits automatically. You can add shield value, magical items, cover, spell effects, and temporary bonuses. The result also shows a quick rating. This makes comparison easier for new and experienced players.

Using Results at the Table

Treat the final value as a planning guide. Always confirm special rules with your Dungeon Master. Some features do not stack. Some magical effects replace an armor formula. The notes field helps record source books, house rules, and situational details. The CSV and PDF buttons make the result easy to save.

Building Better Characters

Armor Class is not the only defense. Hit points, saving throws, resistance, positioning, and party support also matter. Still, AC is simple to compare. Use this calculator when choosing equipment, preparing a level up, or testing a risky build. A clear total helps avoid mistakes during fast combat scenes.

Common Stacking Checks

Many armor formulas are alternatives, not additions. Unarmored Defense, natural armor, Mage Armor, and normal armor should be compared. Use the highest valid method unless your table rules say otherwise. Shields, cover, and many magic bonuses can then be added when allowed.

Practical Advice

Create a few sample rows before play. Compare travel gear, stealth gear, and battle gear. A character may carry different protection for different scenes. Heavy armor may improve AC, but it can hurt stealth or require strength. Light armor can keep movement flexible. Balanced choices often work better than the highest possible number. Keep notes for quick table checks later.

Frequently Asked Questions

What is armor class?

Armor class is the target number an attacker usually needs to hit a character. A higher number makes successful weapon and spell attacks less likely.

Does Dexterity always improve AC?

No. Light armor uses full Dexterity. Medium armor limits the Dexterity bonus. Heavy armor ignores Dexterity for AC.

Can I use a shield with Mage Armor?

Usually yes, if your character is proficient and the table allows it. This calculator lets you add shield value separately.

Why is Monk shield value ignored?

Monk Unarmored Defense normally works only without armor and without a shield. The calculator follows that common rule.

Do all bonuses stack?

No. Some effects replace the base formula. Some bonuses stack only when rules allow them. Always check your source and table ruling.

What does enemy hit chance mean?

It estimates how often a creature hits your AC with a chosen attack bonus. Natural one and natural twenty rules are included.

Can I use house rules?

Yes. Select the custom rule method. Enter a custom base AC and choose whether Dexterity is uncapped, capped, or ignored.

Are the downloads automatic?

CSV downloads from the server after calculation. PDF export uses the displayed result and creates a simple saved report.