Calculate Your 5e Armor Class
Your Calculated 5e Armor Class
Base AC: --
Dexterity Modifier: --
Shield Bonus: --
Total Other Bonuses: --
The total Armor Class is derived from your chosen armor type (or unarmored defense), your Dexterity modifier, any shield bonus, and additional magical or miscellaneous bonuses. All values are unitless integers.
AC Contribution Breakdown
This chart visually represents how each component contributes to your total Armor Class.
What is 5e Armor Class (AC)?
In Dungeons & Dragons 5th Edition, your character's Armor Class (AC) is a crucial defensive statistic that determines how difficult it is for enemies to hit them with attacks. When an enemy makes an attack roll, they roll a 20-sided die (d20) and add their attack modifier. If the total equals or exceeds your character's AC, the attack hits. A higher AC means your character is harder to hit and thus more resilient in combat.
This 5e armor class calculator is designed for D&D players, Dungeon Masters (DMs), and character builders who need a quick and accurate way to determine AC based on various factors. Whether you're creating a new character, leveling up, or equipping new gear, understanding your AC is fundamental.
Common Misunderstandings about 5e AC
- Stacking Bonuses: Many players initially assume all AC bonuses stack. However, D&D 5e typically states that you "choose which calculation to use" rather than adding multiple base AC formulas. For instance, you can't add your Monk's Unarmored Defense bonus to your heavy armor's AC. Only specific bonuses (like from a shield, magic items, or certain spells) explicitly state they add to your AC.
- Dexterity Modifier Limits: While Light Armor allows you to add your full Dexterity modifier to your AC, Medium Armor caps this bonus at +2, and Heavy Armor doesn't allow any Dexterity bonus to AC. This is a common point of confusion.
- Unarmored Defense Specifics: Barbarian and Monk Unarmored Defense calculations differ. Barbarians use Dexterity and Constitution, while Monks use Dexterity and Wisdom.
- Unitless Values: AC and its components are always unitless integers. There are no "feet" or "pounds" involved in the direct AC calculation, only numerical values representing defensive capabilities.
5e Armor Class Formula and Explanation
The core 5e armor class calculation follows a simple principle: you determine your base AC, and then add specific bonuses. The most common formula is:
Total AC = Base AC (from Armor/Unarmored Defense) + Dexterity Modifier (if applicable) + Shield Bonus + Magic Bonus + Other Bonuses
Let's break down each variable:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Base AC | The starting AC provided by your chosen armor or unarmored defense feature. | Integer | 10 (No Armor) to 18 (Plate Armor) |
| Dexterity Score | Your character's raw Dexterity ability score. | Integer | 8 to 20 (can be higher with magic) |
| Dexterity Modifier | Derived from your Dexterity Score: `(Score - 10) / 2`, rounded down. | Integer | -1 to +5 (can be higher) |
| Shield Bonus | A flat +2 bonus if you are wielding a shield. | Integer | +0 or +2 |
| Magic Bonus | Bonuses from magical armor, shields, rings of protection, or other magic items. | Integer | +0 to +3 (or more rarely) |
| Other Bonuses | Miscellaneous bonuses from feats (e.g., Defensive Fighting Style), spells (e.g., Shield of Faith), or class features. | Integer | Variable, typically +1 to +3 |
| Constitution Score | Your character's raw Constitution ability score, used for Barbarian's Unarmored Defense. | Integer | 8 to 20 (can be higher) |
| Wisdom Score | Your character's raw Wisdom ability score, used for Monk's Unarmored Defense. | Integer | 8 to 20 (can be higher) |
It's important to remember that certain armor types limit your Dexterity modifier. Light armor allows the full Dexterity modifier. Medium armor allows a maximum of +2 Dexterity modifier. Heavy armor allows no Dexterity modifier bonus. Unarmored Defense calculations are specific to the class.
Practical Examples of 5e Armor Class Calculations
Example 1: Plate Armored Fighter
Let's calculate the AC for a Fighter:
- Inputs:
- Armor Type: Plate Armor (Base AC 18)
- Dexterity Score: 12 (Dex Modifier +1)
- Has Shield: Yes (+2 AC)
- Magic Bonus: +1 (from a +1 Shield)
- Other Bonuses: +1 (from Defensive Fighting Style)
Calculation:
- Base AC (Plate): 18
- Dexterity Modifier: +0 (Heavy Armor ignores Dex modifier)
- Shield Bonus: +2
- Magic Bonus: +1
- Other Bonuses: +1
- Total AC: 18 + 0 + 2 + 1 + 1 = 22
This fighter has a formidable 22 AC, making them very hard to hit.
Example 2: Unarmored Monk
Consider a Monk using their Unarmored Defense feature:
- Inputs:
- Armor Type: Unarmored Defense (Monk)
- Dexterity Score: 16 (Dex Modifier +3)
- Wisdom Score: 14 (Wis Modifier +2)
- Has Shield: No
- Magic Bonus: +0
- Other Bonuses: +0
Calculation:
- Base AC (Unarmored): 10
- Dexterity Modifier: +3
- Wisdom Modifier: +2
- Shield Bonus: +0
- Magic Bonus: +0
- Other Bonuses: +0
- Total AC: 10 + 3 + 2 + 0 + 0 = 15
The Monk's Unarmored Defense provides a respectable 15 AC without any gear.
Example 3: Rogue in Light Armor
Here's a Rogue relying on light armor and high Dexterity:
- Inputs:
- Armor Type: Studded Leather (Base AC 12)
- Dexterity Score: 18 (Dex Modifier +4)
- Has Shield: No
- Magic Bonus: +0
- Other Bonuses: +0
Calculation:
- Base AC (Studded Leather): 12
- Dexterity Modifier: +4 (Light Armor allows full Dex bonus)
- Shield Bonus: +0
- Magic Bonus: +0
- Other Bonuses: +0
- Total AC: 12 + 4 + 0 + 0 + 0 = 16
This Rogue has a solid 16 AC, relying on their agility.
How to Use This 5e Armor Class Calculator
Our DnD 5e AC calculator is designed for ease of use. Follow these simple steps to determine your character's Armor Class:
- Select Armor Type: Use the "Armor Type" dropdown to choose the primary armor your character is wearing. This includes options for "No Armor" and specific light, medium, and heavy armors, along with "Unarmored Defense" options for Monks and Barbarians.
- Enter Dexterity Score: Input your character's Dexterity ability score. The calculator will automatically determine the correct Dexterity modifier and apply any limits based on your chosen armor type.
- Enter Constitution/Wisdom Score (if applicable): If you selected "Unarmored Defense (Barbarian)" or "Unarmored Defense (Monk)", additional input fields for Constitution or Wisdom score will appear. Enter the relevant ability score.
- Check for Shield: If your character is wielding a shield, check the "Has Shield (+2 AC)" box.
- Add Magic Bonus: Enter any total magical bonuses your character receives to their AC. This includes bonuses from magical armor (e.g., +1 plate), magical shields, or items like a Ring of Protection.
- Add Other Bonuses: Input any other miscellaneous bonuses to AC, such as those from feats (like the Defensive Fighting Style), spells (like *Shield of Faith*), or specific class features.
- View Results: The "Your Calculated 5e Armor Class" section will update in real-time, showing your total AC and a breakdown of its components.
- Interpret the Chart: The "AC Contribution Breakdown" chart provides a visual representation of how each element contributes to your final AC.
- Reset or Copy: Use the "Reset" button to clear all inputs and start a new calculation, or use "Copy Results" to easily save your character's AC details.
Remember that all inputs are simple, unitless integers, and the calculator handles the complex rules of 5e armor class calculation for you.
Key Factors That Affect 5e Armor Class
Several elements play a critical role in determining a character's 5e AC. Optimizing these factors is key to building a resilient character.
- Armor Type: This is the most significant factor. Different armor categories (light, medium, heavy) provide varying base AC values and interact differently with Dexterity. Heavy armor offers the highest base AC but no Dex bonus, while light armor offers lower base AC but full Dex bonus.
- Dexterity Score: A high Dexterity score is crucial for characters in light or medium armor, as it directly adds to their AC. Even for unarmored characters, Dexterity is often a component of their defense. For heavy armor users, Dexterity has no direct impact on AC.
- Shield Use: Wielding a shield consistently provides a +2 bonus to AC, making it one of the most straightforward ways to increase defense for many character builds.
- Magical Items: Items like +1, +2, or +3 armor and shields, Rings of Protection, or Cloaks of Protection grant direct magical bonuses to AC, significantly enhancing survivability.
- Class Features: Many classes have features that modify AC. Examples include the Monk's and Barbarian's Unarmored Defense, the Fighter's Defensive Fighting Style (+1 AC), or the Bladesinger Wizard's Bladesong feature (adds Intelligence modifier to AC).
- Spells: Certain spells can temporarily boost AC. *Shield of Faith* (adds +2 AC), *Shield* (adds +5 AC as a reaction), and *Barkskin* (sets AC to 16, ignoring Dex) are prime examples.
- Feats: A few feats can increase AC. The most notable is the *Medium Armor Master* feat, which increases the maximum Dexterity bonus for medium armor from +2 to +3.
Frequently Asked Questions about 5e Armor Class
A: No. D&D 5e rules state that if you have multiple ways to calculate your AC, you choose which one to use. You do not add them together. For example, a Barbarian wearing chain mail uses the chain mail's AC (16) and cannot add their Constitution modifier from Unarmored Defense.
A: It doesn't directly. Heavy armor does not allow you to add your Dexterity modifier to your Armor Class at all. Its high base AC is its primary defensive feature.
A: Both start with a base of 10 + Dexterity modifier. However, Monks add their Wisdom modifier, while Barbarians add their Constitution modifier. This calculator handles both variations correctly.
A: Yes! Bonuses from different sources typically stack unless they are specifically the same type of bonus (e.g., two Rings of Protection wouldn't stack). A +1 breastplate (magical armor bonus) and a Ring of Protection (+1 AC) would both add to your AC.
A: A Dexterity score of 8 results in a -1 Dexterity modifier. If you're wearing light armor, this would actually reduce your AC. For medium armor, it would be capped at +2, so a -1 modifier would still be -1. Heavy armor ignores it. This calculator correctly applies negative modifiers.
A: No. The *Shield* spell is a reaction that grants a +5 bonus to AC until the start of your next turn. It's a temporary boost, not a permanent modification to your base AC. This calculator focuses on persistent AC values, so you'd manually add such temporary bonuses during gameplay.
A: No, AC values are unitless integers. They represent a numerical threshold that an attacker must meet or exceed. This 5e armor class calculator deals exclusively with these numerical values.
A: The *Medium Armor Master* feat increases the maximum Dexterity bonus you can add to medium armor from +2 to +3. You would simply ensure your Dexterity score and modifier are correctly reflected, and the calculator will cap it at +3 for medium armor if your modifier is higher, assuming you selected a medium armor type and have this feat in mind when interpreting the Dex modifier.
Related Tools and Internal Resources
Enhance your D&D 5th Edition experience with our other helpful tools and guides:
- 5e Character Builder: Create and manage your D&D 5e characters from scratch, integrating 5e armor class calculation seamlessly.
- 5e Spell Calculator: Calculate spell attack bonuses, saving throw DCs, and damage for your spellcasters.
- 5e Damage Calculator: Determine average damage output for various weapon and spell attacks.
- 5e Ability Score Generator: Roll or generate ability scores for your new characters using various methods.
- 5e Encumbrance Calculator: Keep track of your character's carrying capacity and movement penalties.
- D&D 5e Guides: A comprehensive collection of articles and tips for players and DMs alike, including advanced strategies for optimizing your DnD 5e AC.