GAME & ENTERTAINMENT – RPG & CHARACTER BUILDING CALCULATOR
Dnd Attack Bonus
A precise tool.
What is the Dnd Attack Bonus & How does it work?
In Dungeons & Dragons, every character has six ability scores ranging from 1 to 30. The most relevant for melee attacks is Strength, while ranged attacks use Dexterity. From each ability score you derive an ability modifier, calculated as the floor of (Score − 10) divided by 2.
Characters also gain a proficiency bonus that scales with level, typically ranging from +2 at level 1 to +6 at level 17‑20. If a character is proficient with a weapon, this bonus is added to the attack roll; otherwise it is omitted.
The total attack bonus is the sum of the ability modifier and the proficiency bonus (when applicable). This can be expressed with the following formula:
\left\lfloor\frac{Ability – 10}{2}\right\rfloor + PB
PB = proficiency bonus (added only if proficient)
Parameters
Result
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Frequently Asked Questions
How do I calculate my ability modifier in Dungeons & Dragons?
Subtract 10 from your ability score and divide by 2, rounding down to the nearest whole number.
What is the proficiency bonus for a level 5 character?
A level 5 character has a proficiency bonus of +3.
How does proficiency affect my attack roll in D&D?
If you are proficient with your weapon, add your proficiency bonus to your attack roll.
What ability score do I use for a ranged attack?
For ranged attacks, you use your Dexterity score.
Can my character have multiple proficiency bonuses?
No, characters have only one proficiency bonus that applies to all proficient skills and weapons.
What is the maximum ability modifier in Dungeons & Dragons?
The maximum ability modifier is +10, which occurs at an ability score of 30.
How does a character gain proficiency in a weapon?
A character gains proficiency through class features or background abilities.
Results are for informational purposes only and do not constitute professional advice.