Proficiency Bonus Explained (5e Table by Level)

What Is the Proficiency Bonus in D&D 5e?

The proficiency bonus is one of the most important numbers on your Dungeons and Dragons 5th edition character. It is a single value, tied to your character level, that you add to a huge range of d20 rolls: attacks you are trained with, skills you are proficient in, saving throws your class grants, your spell save DC, and your spell attack rolls. Because it touches so many parts of the game, understanding the proficiency bonus is the difference between a character that plays correctly and one that quietly does the wrong math every session.

The elegant part of the 5e design is that this bonus is universal. Instead of tracking dozens of separate progressions like older editions did, 5e uses one clean number that grows as you gain levels. Whether you are a level 3 Rogue picking a lock or a level 17 Wizard casting a spell, the underlying idea is identical: if you are proficient, you add your proficiency bonus. If you are not, you do not. That is the whole system in a sentence.

If you are still setting up your hero and want a clean place to record every number we cover here, grab a printable character sheet before you read on. Everything below maps directly to boxes on that sheet.

What the Proficiency Bonus Applies To

The proficiency bonus is not something you sprinkle on every roll. It applies only where your character has earned proficiency. Here are the five main places it shows up.

1. Attack Rolls You Are Proficient With

When you attack with a weapon you are proficient in, you add your proficiency bonus to the attack roll. A Fighter is proficient with martial weapons, so a longsword swing gets the bonus. A Wizard is not proficient with a greataxe, so if a Wizard somehow swings one, no bonus applies. The same rule covers unarmed strikes, natural weapons, and improvised weapons when your class grants proficiency.

2. Skill Checks You Are Proficient In

Each skill is tied to an ability score. When you make a check with a skill you are proficient in, you add your proficiency bonus on top of the relevant ability modifier. A character proficient in Stealth adds the bonus to Dexterity (Stealth) checks. If you are not proficient, you roll with only the ability modifier. To understand which ability powers which skill, our guide to ability scores breaks down all six stats and their associated skills.

3. Saving Throws Your Class Grants

Every class grants proficiency in two saving throws. A Barbarian is proficient in Strength and Constitution saves, so those two saves get the proficiency bonus added. The other four saves for that Barbarian use only the raw ability modifier. This is why some characters shrug off certain effects easily while being vulnerable to others.

4. Spell Save DC

If your character casts spells, your spell save DC tells enemies how hard your magic is to resist. The formula is: 8 + your proficiency bonus + your spellcasting ability modifier. The proficiency bonus is baked directly into that number, which means your spells get harder to resist automatically as you level up.

5. Spell Attack Rolls

Some spells, like Fire Bolt or Ray of Frost, require an attack roll instead of a saving throw. Your spell attack bonus is your proficiency bonus + your spellcasting ability modifier. You add this to the d20 when you roll to hit a target with such a spell.

Proficiency Bonus by Level: The Full Table

Here is the single most searched piece of information about this rule: the proficiency bonus by level. In 5e, the bonus does not increase every level. It steps up every four levels, following a clean pattern from +2 at level 1 to +6 at level 20.

A quick way to remember the tiers:

• Levels 1 to 4: +2
• Levels 5 to 8: +3
• Levels 9 to 12: +4
• Levels 13 to 16: +5
• Levels 17 to 20: +6

If you prefer a formula over a table, you can calculate it directly. The proficiency bonus equals 2 + the floor of (level minus 1) divided by 4. At level 11, that is 2 + floor(10 / 4) = 2 + 2 = +4. Most players simply memorize the five tiers, since they never change.

How to Calculate and Add the Proficiency Bonus

Adding the bonus correctly follows a simple three step process for any roll.

• Step 1: Find your proficiency bonus from the table based on your character level.
• Step 2: Ask whether you are proficient in the thing you are rolling. If yes, the bonus applies. If no, it does not.
• Step 3: Add the bonus to the relevant ability modifier and the d20 result.

A common formula for a proficient skill check looks like this: d20 roll + ability modifier + proficiency bonus. For an attack roll it is: d20 roll + ability modifier + proficiency bonus. For your spell save DC there is no d20 at all, since it is a static number: 8 + ability modifier + proficiency bonus.

Concrete Examples

Numbers make this concrete. Let us walk through three characters at different levels.

Example 1: Level 3 Rogue Picking a Lock

Our Rogue is level 3, so the proficiency bonus is +2. She has a Dexterity modifier of +3 and is proficient with thieves' tools. To pick a lock she rolls a d20, then adds her Dexterity modifier (+3) and her proficiency bonus (+2). If she rolls a 12, her total is 12 + 3 + 2 = 17. If a Rogue subclass grants Expertise on thieves' tools, that bonus would double, which we cover below.

Example 2: Level 7 Cleric Casting a Spell

A level 7 Cleric has a proficiency bonus of +3. With a Wisdom modifier of +4, her spell save DC is 8 + 3 + 4 = 15. When she casts Guiding Bolt, which uses a spell attack roll, her attack bonus is +3 (proficiency) + 4 (Wisdom) = +7. She rolls a d20 and adds 7 to hit.

Example 3: Level 13 Fighter Making an Attack

A level 13 Fighter has a proficiency bonus of +5. He wields a greatsword, is proficient with martial weapons, and has a Strength modifier of +4. His attack roll is d20 + 4 (Strength) + 5 (proficiency). A roll of 10 becomes 10 + 4 + 5 = 19. Notice how much a high level character benefits from that growing bonus.

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Expertise: Double Proficiency

Some class features let a character double their proficiency bonus on specific skills or tools. This is called Expertise. Rogues and Bards are the classic examples, gaining Expertise in a handful of chosen skills as they level.

The math is straightforward. Take your normal proficiency bonus and add it a second time. A level 5 Rogue with Expertise in Stealth has a proficiency bonus of +3, so Expertise gives +6 on Stealth checks. Combined with a Dexterity modifier of +4, that Rogue rolls d20 + 4 + 6, which is a formidable +10 before the die even lands.

Expertise applies only to the specific skills or tools chosen, not to every proficient skill. It never applies to attacks, saving throws, or spell numbers. It is a targeted upgrade that turns a specialist into a true master of their craft.

Monsters, Challenge Rating, and Proficiency Bonus

Monsters use a proficiency bonus too, but it is tied to their Challenge Rating (CR) rather than a character level. A higher CR creature has a higher proficiency bonus, which the Dungeon Master uses when calculating the monster's attack bonuses, save DCs, and skill checks.

The scaling is broader for monsters. A CR 0 to 4 creature has a +2 proficiency bonus, CR 5 to 8 has +3, CR 9 to 12 has +4, and so on, climbing higher for the most legendary threats. When a Dungeon Master builds or reflavors a monster, this bonus is already baked into the published stat block, so most players never have to calculate it. It matters most when you are homebrewing a creature or adjusting an existing one.

Common Mistakes to Avoid

Even experienced players trip over the proficiency bonus. Here are the errors that show up most often at the table.

• Adding it twice. The most common mistake is applying the proficiency bonus and then adding it again, usually because a player confuses it with Expertise. Unless a feature explicitly grants Expertise, you add the bonus exactly once.
• Forgetting it entirely. New players often forget the bonus on attack rolls or saving throws, which makes their character weaker than intended. Write the final totals on your sheet so you never miss it.
• Adding it to things you are not proficient in. The bonus applies only where you have proficiency. Do not add it to a skill or weapon your class never granted.
• Applying it to raw ability checks. A plain Strength check with no skill attached does not get the bonus. Only proficient skills, saves, attacks, and spell numbers qualify.
• Forgetting to update it when you level up. When you cross into a new tier (level 5, 9, 13, or 17), your bonus goes up. Update every proficient total on your sheet at that moment.

Why the Proficiency Bonus Matters for Your Game

The proficiency bonus is the quiet engine that keeps 5e balanced. It ensures that a trained character stays meaningfully better at their specialties than an untrained one, while the four level tiers keep the growth smooth and predictable. Because it feeds into attacks, skills, saves, and spellcasting all at once, mastering this one number instantly makes you more confident with the whole system.

Once the math is second nature, all that is left is rolling the dice and enjoying the story. If you want reliable, great looking dice to bring that math to life at the table, browse our full range of dice sets and find a set that matches your character.

Frequently Asked Questions

What is the proficiency bonus at level 1?

At level 1, and all the way through level 4, the proficiency bonus is +2. It first increases to +3 at level 5.

Does the proficiency bonus increase every level?

No. It increases every four levels. It is +2 at levels 1 to 4, +3 at levels 5 to 8, +4 at levels 9 to 12, +5 at levels 13 to 16, and +6 at levels 17 to 20.

Do I add my proficiency bonus to every roll?

No. You add it only when you are proficient in what you are rolling: proficient weapons, proficient skills, class saving throw proficiencies, spell save DC, and spell attack rolls. Rolls where you lack proficiency use only the ability modifier.

How does the proficiency bonus work with Expertise?

Expertise doubles your proficiency bonus for the specific skills or tools it applies to. At a +3 bonus, Expertise makes it +6 on those chosen skills. It does not affect attacks, saves, or spell numbers.

Is the proficiency bonus added to my spell save DC?

Yes. Your spell save DC is 8 + your proficiency bonus + your spellcasting ability modifier. The bonus is built into the formula and rises automatically as you gain levels.

Do monsters use a proficiency bonus?

Yes, but it scales with Challenge Rating instead of character level. It is already factored into a published monster's stat block, so players rarely need to calculate it themselves.

What is the highest proficiency bonus a character can reach?

For a standard 20th level character, the maximum proficiency bonus is +6. Certain rare features or Epic Boons can push it higher in some games, but +6 is the normal cap.