5eHP.app

5e Armor Class (AC) Calculator

Calculate Armor, Shields, Unarmored Defense, Spells & Fighting Styles.

17Armor Class (AC)
Rules Valid — Ready for Play

Complete 5e Armor, Shield & Price Table

Armor Class determines the attack roll threshold an enemy must meet or exceed to deal Hit Point damage to your character. Together with your Max Hit Points, AC forms half of your combat survivability equation: raising AC by +2 reduces incoming weapon hits by roughly 10 percentage points per attack roll. Check every armor piece's base AC, DEX limit, Strength requirement, weight, and Stealth penalty below.

Armor Category Cost Armor Class (AC) Strength Stealth Weight
PaddedLight5 gp11 + DEX mod—Disadvantage8 lb.
LeatherLight10 gp11 + DEX mod——10 lb.
Studded LeatherLight45 gp12 + DEX mod——13 lb.
HideMedium10 gp12 + DEX mod (max 2)——12 lb.
Chain ShirtMedium50 gp13 + DEX mod (max 2)——20 lb.
Scale MailMedium50 gp14 + DEX mod (max 2)—Disadvantage45 lb.
BreastplateMedium400 gp14 + DEX mod (max 2)——20 lb.
Half PlateMedium750 gp15 + DEX mod (max 2)—Disadvantage40 lb.
Ring MailHeavy30 gp14—Disadvantage40 lb.
Chain MailHeavy75 gp16STR 13Disadvantage55 lb.
SplintHeavy200 gp17STR 15Disadvantage60 lb.
PlateHeavy1,500 gp18STR 15Disadvantage65 lb.
ShieldShield10 gp+2 bonus——6 lb.

Base AC Formulas vs. Flat Bonuses: What Actually Stacks?

The number one source of illegal AC math in 5e happens when a player mixes two base armor calculations—for example, a Draconic Sorcerer/Barbarian trying to compute 13 + DEX + CON, or a Monk casting Mage Armor expecting 13 + DEX + WIS. The official rule is simple: you can only use one base AC formula at a time.

Choosing Between Light, Medium, Heavy, and Unarmored

Use 27-Point Buy strategically alongside your armor proficiency:

  1. DEX-Primary Characters (Rogues, Rangers, Monks): Studded Leather reaches 17 AC at 20 DEX (12 + 5), matching Half Plate without Stealth Disadvantage or weight. Monks match Plate (18 AC) once DEX and WIS reach 18/+4 each.
  2. Casters & Valor/Hex Clerics (14 DEX): Stopping Dexterity at 14 (+2) with Medium Armor (Half Plate 15 + 2 + Shield = 19 AC) is the single cheapest way in 5e to keep high Armor Class while still affording 14–16 Constitution for HP and Concentration.
  3. Barbarians: Because you want 16+ CON anyway for Hit Points and Rage tanking, Barbarians often match or beat Medium Armor once DEX + CON totals +6, while also gaining full advantage of wielding a Shield with Unarmored Defense when Sword-and-Board tanking.
  4. Heavy Armor Tanks: Plate + Shield + Defense Fighting Style hits 21 AC before any magic items, letting you dump Dexterity down to 8 or 10 and put every remaining Point Buy point into Strength, Constitution, and mental saves.

Frequently Asked Questions

Do Mage Armor and Unarmored Defense stack in 5e?

No. Both Mage Armor (13 + DEX) and Barbarian/Monk Unarmored Defense are separate base AC formulas. If multiple features give different ways to calculate base AC, you choose only one formula—never add them together.

Can a Barbarian or Monk use a Shield with Unarmored Defense?

Barbarians can use a shield (+2 AC) and still benefit from Unarmored Defense (10 + DEX + CON + 2). Monks cannot use a shield with Monk Unarmored Defense; equipping a shield disables the +WIS bonus.

Does a high Dexterity modifier hurt Heavy Armor AC?

No. Heavy armor sets a fixed base AC (14 to 18) and ignores your Dexterity modifier completely—meaning a negative DEX modifier does not reduce your Heavy Armor AC either.

Does the Defense Fighting Style work with Mage Armor or Unarmored Defense?

No. Defense Fighting Style (+1 AC) explicitly requires wearing physical Light, Medium, or Heavy armor. It does not apply while unarmored or under Mage Armor alone.

What happens if I wear Heavy Armor without meeting the Strength requirement?

You still get the full Armor Class benefit of Chain Mail (STR 13), Splint (STR 15), or Plate (STR 15), and you do not suffer attack penalties as long as you have Heavy Armor proficiency—your walking speed simply drops by 10 feet.