How do you calculate AC in 5e?

Calculating AC in 5e: A Step-by-Step Guide

Armour Class (AC) is a crucial mechanic in Dungeons & Dragons 5th Edition (5e), as it determines the likelihood of a character being hit by an enemy attack. In this article, we will delve into the process of calculating AC, exploring the various ways it can be influenced, and highlighting the most important tips for players and game masters alike.

Calculating Unarmored AC

Before we dive into armored calculations, let’s explore the process of calculating an unarmored AC. In 5e, the base AC for an unarmored character is calculated as follows:

AC = 10 + Dexterity Modifier

• Dexterity Modifier: This refers to the character’s Dexterity score, which ranges from -5 to 5. For example, if the character has a Dexterity score of 18, their Dexterity Modifier would be +4.
• Adding the modifier: The Dexterity Modifier is added to the base value of 10 to create the character’s AC. For example, a character with a Dexterity Modifier of +4 would have an AC of 14 (10 + 4).

Calculating Armored AC

Now, let’s move on to calculating AC for armored characters. The process is slightly more complex, but follows a similar pattern. In 5e, armored AC is calculated as follows:

AC = (Base AC) + Dexterity Modifier + Armoured Class Adjustment

• Base AC: The base AC for an unarmored character, as calculated above.
• Dexterity Modifier: As described above, this is the character’s Dexterity score, ranging from -5 to 5.
• Armoured Class Adjustment: This is an adjustment made to the AC based on the type and level of armour worn by the character. The AC adjustments for different types of armour are as follows:
  • Light armour: +2
  • Medium armour: +5
  • Heavy armour: +10
• Example: A character wearing medium armour with a Dexterity score of 18, resulting in a Dexterity Modifier of +4, would have an AC of (10 + 4 + 5) = 19.

The Effect of Shield on AC

In 5e, shields can also be used to enhance a character’s AC. When a shield is used, the player should add 2 to their AC. This adjustment applies regardless of the character’s Dexterity score.

Calculating AC for Half-Humanoid Hybrids

For half-humanoid hybrids, such as a half-elf, calculating AC is slightly different. The AC for half-humanoid hybrids is based on the parent species. The following table outlines the base AC for half-humanoid hybrids:

Tips for Optimizing AC

As you can see, there are many factors that contribute to a character’s AC in 5e. To optimize your AC, it’s essential to:

• Choose the right armour: Select armour that is suitable for your character’s level and playstyle. Light armour is a good choice for characters that prefer speed and agility, while medium or heavy armour is more suitable for characters that rely on defence.
• Increase your Dexterity: Investing in Dexterity boosts will significantly enhance your character’s AC, making them more difficult to hit.
• Wear a shield: Shieds can greatly improve a character’s AC, and can be particularly effective when used in conjunction with Dexterity-based builds.
• Use magic items: Some magic items, such as bracers of AC, can temporarily or permanently boost a character’s AC.

By understanding how to calculate AC in 5e and employing the tips outlined above, you can create characters that are formidable opponents, while also providing a thrilling adventure for your fellow players.

Conclusion

Armour Class is a fundamental concept in Dungeons & Dragons 5th Edition, and is an essential component of building effective characters. By grasping the various ways AC is calculated, and adapting these calculations to your unique build and playstyle, you’ll be well on your way to creating a character that’s virtually unstoppable. So next time you’re in character creation mode, take a few extra minutes to optimize that AC – your character’s – and your fellow adventurers, will thank you.