Bg3 Build Calculator

Optimize your Baldur's Gate 3 character stats, abilities, and equipment to create the ultimate hero.

Character Build Planner

Proficiency Bonus vs. Level

What is a BG3 Build Calculator?

A BG3 build calculator is an essential tool for any Baldur's Gate 3 player looking to optimize their character's effectiveness. Baldur's Gate 3 features a complex system of statistics, abilities, feats, spells, and equipment that can be overwhelming. This calculator simplifies the process by allowing you to input key character attributes and see how they translate into tangible combat and utility bonuses. It helps players plan powerful character builds, understand the impact of different choices, and ensure their character is well-suited for the challenges ahead, whether you're playing a mighty Barbarian or a cunning Rogue.

Who should use it?:

• New players trying to grasp the game's mechanics.
• Experienced players aiming for min-maxed, optimized builds.
• Players experimenting with different class combinations or races.
• Anyone who wants to visualize the numerical impact of their character choices.

Common misunderstandings often revolve around how modifiers and proficiency bonuses stack, and the exact values at different character levels. This tool aims to clarify those aspects.

BG3 Build Calculator Formula and Explanation

The BG3 Build Calculator works by combining fundamental RPG statistics to project key combat and defensive metrics. The core formulas are designed to reflect the game's underlying mechanics:

Core Formulas

• Ability Modifier: Calculated as (Ability Score - 10) / 2, rounded down. A score of 16 yields a +3 modifier.
• Proficiency Bonus: This bonus increases at specific character levels, representing growing expertise. It's added to attacks, saves, and skill checks.
• Total Attack Roll: Proficiency Bonus + Primary Ability Modifier + Attack Bonus (Gear/Spells). This determines the likelihood of hitting a target.
• Total Damage Roll: Primary Ability Modifier + Damage Bonus (Gear/Spells). This determines the base damage dealt on a successful hit.
• Total Saving Throw: Proficiency Bonus + Modifier of the Saving Throw Type + Saving Throw Bonus (Gear/Spells). This determines the likelihood of resisting detrimental effects.
• Armor Class (AC): 10 (Base) + Dexterity Modifier + Armor/Shield/Gear Bonuses. This determines the difficulty for enemies to hit you with attacks.

Variables Table

BG3 Build Calculator Variables

Variable	Meaning	Unit/Type	Typical Range
Character Level	The current or desired level of the character.	Level (1-12)	1-12
Primary Ability Score	The base numerical value of the character's main ability.	Score (e.g., 8-20)	8-20 (base), can be higher with items/buffs.
Primary Ability Modifier	The bonus/penalty derived from the Ability Score.	Modifier (+/- Integer)	-1 to +5 (typical base)
Proficiency Bonus	A flat bonus added to certain rolls based on level.	Bonus (+ Integer)	+2 to +5
Attack Bonus (Gear/Spells)	Flat bonuses to attack rolls from equipment or abilities.	Bonus (+ Integer)	0 to +5+
Damage Bonus	Flat bonuses to damage rolls from equipment or abilities.	Bonus (+ Integer)	0 to +5+
Saving Throw Type	The ability score governing the saving throw.	Type (STR, DEX, CON, INT, WIS, CHA)	N/A
Saving Throw Bonus (Gear/Spells)	Flat bonuses to specific saving throws from equipment or abilities.	Bonus (+ Integer)	0 to +5+
Armor Class (AC)	The target number an attack must meet or exceed to hit.	Rating (Integer)	10+

Practical Examples

Example 1: Level 5 Fighter (Strength Build)

A Level 5 Fighter focusing on Strength.

• Inputs: Level: 5, Primary Ability: Strength, Score: 18, Attack Bonus: +1 (from a magic sword), Damage Bonus: +2 (from the same sword), Saving Throw Type: Strength, Saving Throw Bonus: +0, AC: 17 (Chain Mail + Shield)
• Assumptions: Strength modifier is +4 (from 18). Proficiency Bonus at level 5 is +3. AC Base is 10 + Dex Mod (0 for Heavy Armor) + Armor (16) + Shield (+2) = 18? No, Chain Mail is 16, Shield is +2. So 16+2 = 18. The calculator uses base 10 + Dex mod. Let's assume Dex mod is 0. AC = 10 + 0 + 16 (Chain) + 2 (Shield) = 18. For simplicity with inputs, let's say base AC is 17 from gear.
• Results:
  • Proficiency Bonus: +3
  • Strength Modifier: +4
  • Total Attack Roll: +3 (Prof) + +4 (STR) + +1 (Sword) = +8
  • Total Damage Roll: +4 (STR) + +2 (Sword) = +6
  • Primary Saving Throw Total (STR): +3 (Prof) + +4 (STR) + +0 = +7
  • Armor Class (AC): 17

Example 2: Level 8 Sorcerer (Charisma Build)

A Level 8 Sorcerer focusing on spellcasting and control.

• Inputs: Level: 8, Primary Ability: Charisma, Score: 17, Attack Bonus: +0, Damage Bonus: +0 (Spells use spell attack/DC), Saving Throw Type: Charisma, Saving Throw Bonus: +1 (from an amulet), AC: 14 (Mage Armor + Dex)
• Assumptions: Charisma modifier is +3 (from 17). Proficiency Bonus at level 8 is +3. Spell Attack Rolls use Spellcasting Modifier + Proficiency Bonus. For simplicity, this calculator focuses on standard attack/damage rolls. AC Base is 10 + Dex Mod (+2) + Mage Armor (+3) = 15. Calculator input for AC = 14 likely reflects specific gear.
• Results:
  • Proficiency Bonus: +3
  • Charisma Modifier: +3
  • Total Attack Roll: +3 (Prof) + +3 (CHA) + +0 = +6 (Note: Spell Attack Rolls may differ)
  • Total Damage Roll: +3 (CHA) + +0 = +3 (Note: Spell damage is complex)
  • Primary Saving Throw Total (CHA): +3 (Prof) + +3 (CHA) + +1 (Amulet) = +7
  • Armor Class (AC): 14

How to Use This BG3 Build Calculator

1. Enter Character Level: Input your character's current or desired level. This affects your Proficiency Bonus.
2. Primary Ability Score: Enter the base score for your character's main stat (e.g., Strength for a Fighter, Intelligence for a Wizard).
3. Attack & Damage Bonuses: Add any flat bonuses to attack rolls and damage rolls provided by your weapons, armour, or class features. For spellcasters, these might be 0 for standard attacks, but consult specific spell descriptions.
4. Saving Throw: Select the saving throw type your character is most focused on (often their primary ability score). Enter any flat bonuses from gear or abilities that specifically boost this save.
5. Armor Class (AC): Input your character's total AC. This is typically calculated as 10 + Dexterity Modifier + Armour Bonus + Shield Bonus + other effects.
6. Calculate: Click the "Calculate Build Stats" button.
7. Interpret Results: Review the summary which shows your total Attack Roll, Damage Roll, Saving Throw total, and AC.
8. Experiment: Adjust inputs to see how different choices affect your build's effectiveness. Use the "Reset" button to start over.

Pay close attention to the "Proficiency Bonus vs. Level" chart to understand how your core bonuses scale.

Key Factors That Affect BG3 Builds

1. Ability Scores: The foundation of your character. Higher scores mean better modifiers, directly impacting attack, damage, saves, and skill checks. Balancing scores is key.
2. Class Features: Each class grants unique abilities, proficiencies, and bonus actions that fundamentally shape a build. Multiclassing requires careful consideration of these synergies.
3. Feats: Powerful choices gained at specific levels that offer significant buffs, new abilities, or attribute increases. Selecting the right feats is crucial for specialization.
4. Equipment: Weapons, armour, rings, amulets, and cloaks provide stat boosts, unique effects, and sometimes new spells or abilities. Gear synergy can make or break a build. This calculator accounts for flat bonuses provided by gear.
5. Spells and Abilities: The effectiveness of spellcasters and ability-focused classes heavily relies on their spell list, spell slots, and the scaling of their abilities. Spell attack rolls and save DCs are complex metrics often calculated separately.
6. Consumables and Buffs: Potions, scrolls, and temporary buffs can significantly enhance a character's stats for short periods, allowing for burst damage or overcoming difficult challenges.
7. Race: Racial traits offer inherent bonuses and abilities that can synergize well with certain classes and builds.

FAQ

• Q1: How is the Ability Modifier calculated?
  A1: It's calculated using the formula (Score – 10) / 2, rounded down. A score of 10-11 gives +0, 12-13 gives +1, 14-15 gives +2, 16-17 gives +3, and 18-19 gives +4.
• Q2: What is the Proficiency Bonus at different levels?
  A2: It typically starts at +2 (Levels 1-4), increases to +3 (Levels 5-8), then +4 (Levels 9-11), and finally +5 at Level 12.
• Q3: Does this calculator handle spell attack rolls and save DCs?
  A3: This calculator focuses on standard attack/damage rolls and saving throws. Spell attack rolls usually use your spellcasting ability modifier + proficiency bonus. Spell Save DCs are calculated as 8 + proficiency bonus + spellcasting ability modifier. These are complex and depend heavily on class and specific spells, so they are not directly calculated here but are influenced by the base ability score.
• Q4: My calculated Attack Roll seems low. What could be wrong?
  A4: Ensure you've correctly entered your Proficiency Bonus for the level, your Primary Ability Modifier, and any Attack Bonus from gear. Check if you're using the right primary stat for your class.
• Q5: How does Dexterity affect my build if I'm not a Dex-based character?
  A5: Dexterity is crucial for Armor Class (AC) if you're not wearing heavy armour, and it affects initiative (turn order) and some skill checks like Stealth and Sleight of Hand.
• Q6: What does "Base AC" mean?
  A6: The base AC is usually 10. Your actual AC is derived from 10 + Dexterity Modifier (if applicable) + Armour/Shield bonuses. Heavy armour often replaces the Dex bonus.
• Q7: Can I use this for multiclass builds?
  A7: Yes, you can input the level and relevant stats for any character. However, remember that multiclassing might grant different proficiency bonuses or access to unique features not directly factored into these basic calculations.
• Q8: Where can I find information on specific gear bonuses?
  A8: In-game tooltips are the best source. Websites like Fextralife or IGN often have comprehensive lists of equipment and their stats for Baldur's Gate 3.