PF2E Combat Calculator

Analyze your character’s combat effectiveness with this advanced pf2e combat calculator. Determine average damage, hit probabilities, and more.

Average Damage Per Round (3 Attacks)

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Intermediate Values (Attack Breakdown)

Formula Explanation: Average Damage Per Round (DPR) is calculated by summing the expected damage from three consecutive Strikes. Expected damage for each Strike is `(Crit Chance * Crit Damage) + (Hit Chance * Normal Damage)`. Hit and crit chances are determined by comparing your attack roll against the target’s AC, accounting for Pathfinder 2e’s “beat by 10” critical success rule and the Multiple Attack Penalty (MAP) of 0, -5/-4 (agile), and -10/-8 (agile).

Probability Chart (First Attack)

A visual breakdown of the four possible outcomes for your first attack.

What is a pf2e combat calculator?

A pf2e combat calculator is a specialized tool designed for players and Game Masters (GMs) of the Pathfinder Second Edition (PF2e) tabletop roleplaying game. Its primary purpose is to automate the complex probability calculations involved in the game’s combat system. Instead of manually calculating probabilities, users can input key statistics like attack bonuses, target Armor Class (AC), and damage values to instantly see metrics like their average Damage Per Round (DPR). This is invaluable for both theorycrafting character builds and for GMs to quickly gauge the threat level of their monsters. This tool goes beyond simple dice rolling by analyzing the statistical likelihood of success, failure, critical success, and critical failure, which are core components of PF2e’s “four degrees of success” system.

The pf2e combat calculator Formula and Explanation

The core of any pf2e combat calculator rests on the fundamental formula of an attack roll versus a Difficulty Class (DC), which in the case of attacks, is the target’s Armor Class (AC). The probabilities are affected by the Multiple Attack Penalty (MAP), which makes subsequent attacks in a turn less likely to hit. For a much more detailed analysis, consider using a pathfinder 2e dpr calculator for specific monster statistics.

The probability calculation for a single attack is as follows:

• Target to Hit: `Target AC – Your Attack Bonus`
• Chance to Hit: `(21 – (Target AC – Attack Bonus)) / 20`
• Chance to Critically Hit: `(21 – (Target AC + 10 – Attack Bonus)) / 20`

These probabilities are then used to determine the expected damage from a single strike, which is then calculated for all three potential attacks in a round (with increasing MAP) and summed for the total DPR.

Key Variable Explanations

Variable	Meaning	Unit (auto-inferred)	Typical Range
Attack Bonus	The total modifier added to a d20 roll to hit an enemy.	Attack Modifier	+4 to +30+
Target AC	The Armor Class of the target creature.	Armor Class	12 to 50+
Damage Dice	The dice rolled for weapon or spell damage.	Dice Type (d4-d12)	1d4 to 4d12+
MAP	Multiple Attack Penalty applied to 2nd and 3rd attacks.	Attack Penalty	-5 (-4 agile) / -10 (-8 agile)

Practical Examples

Example 1: Level 3 Fighter vs. Ogre Warrior

A fighter with a +11 attack bonus attacks an Ogre Warrior (AC 18) with a greatsword (1d12+4 damage). The fighter wants to know if it’s worth attacking three times.

• Inputs: Attack Bonus: 11, Target AC: 18, Damage: 1d12+4
• 1st Attack (0 MAP): High chance to hit and a decent chance to crit. Expected damage is high.
• 2nd Attack (-5 MAP): The fighter’s attack bonus becomes +6. The chance to hit drops significantly but is still viable.
• 3rd Attack (-10 MAP): The fighter’s attack bonus becomes +1. The chance to hit is very low, likely making another action (like Raising a Shield) a better choice.
• Result: The calculator would show a high DPR for the first attack, moderate for the second, and very low for the third, advising that two attacks are likely the optimal choice before using a different action. To learn more about action economy, see this guide to actions and activities.

Example 2: Level 5 Rogue vs. Evoker Wizard

A rogue with an agile rapier (1d6+4 damage) and a +13 attack bonus attacks a flat-footed Evoker Wizard (AC 19, flat-footed AC 17). The agile trait reduces MAP.

• Inputs: Attack Bonus: 13, Target AC: 17, Damage: 1d6+4, Agile: Yes
• 1st Attack (0 MAP): Very high chance to hit the lower flat-footed AC.
• 2nd Attack (-4 MAP): Attack bonus is +9. Still a very good chance to hit.
• 3rd Attack (-8 MAP): Attack bonus is +5. A low, but not impossible, chance to hit. The calculator might show that this third attack is worth the risk, especially if the rogue has other damage-boosting effects. For more on this, read about how to calculate damage in pathfinder 2e.

How to Use This pf2e combat calculator

1. Enter Attacker Stats: Input your character’s total attack bonus in the first field. This should include proficiency, ability modifier, and item bonuses.
2. Enter Target AC: Input the Armor Class of the creature you are attacking.
3. Define Damage: Set the number of dice, type of die, and any flat damage bonuses for your attack.
4. Select Traits: Check the ‘Agile Trait’ box if your weapon has it. This correctly adjusts the Multiple Attack Penalty.
5. Review Results: The calculator automatically updates. The primary result shows your average Damage Per Round if you make all three attacks. The intermediate values break this down per attack, helping you decide when to stop attacking and use a different action.
6. Analyze the Chart: The pie chart provides a clear visual of your chances on the crucial first attack, helping you quickly assess risk.

Key Factors That Affect Combat Outcomes

• Multiple Attack Penalty (MAP): The single most important factor for deciding how many times to attack. As this calculator shows, the third attack is often a very low-probability action.
• Agile Trait: Significantly increases the viability of second and third attacks, making it a powerful weapon trait. Understanding the pf2e multiple attack penalty is key.
• Buffs and Debuffs: A +1 status bonus from a spell like *Bless* or a -1 circumstance penalty to the enemy’s AC from being flanked can swing probabilities significantly due to PF2e’s critical hit system.
• Flat-Footed Condition: Lowering a target’s AC by 2 is a massive advantage, dramatically increasing both hit and crit chance.
• Damage Dice vs. Flat Damage: Flat damage is more reliable, while dice add variance. On a critical hit, all damage (including from dice and flat modifiers) is doubled, making high flat bonuses especially potent.
• Degrees of Success: The “beat AC by 10” rule for critical hits means that high attack bonuses are rewarded exponentially, as they increase the chance to turn a normal hit into a devastating critical. Knowing the pf2e critical hit chance can greatly influence your strategy.

Frequently Asked Questions (FAQ)

Q: Does this calculator account for the “degree of success” rules?

A: Yes. It correctly calculates the four degrees of success (Critical Miss, Miss, Hit, Critical Hit) based on the “meet or beat DC” and “beat DC by 10” rules.

Q: How is average die damage calculated?

A: The average result of a die is calculated as `(Die Sides + 1) / 2`. For example, a d8’s average is 4.5.

Q: Why is my third attack’s DPR so low?

A: The standard Multiple Attack Penalty for a third attack is -10 (-8 with an agile weapon). This severe penalty drastically reduces your chance to hit and crit, making the expected damage very low against most on-level enemies.

Q: Does this work for spell attacks?

A: Yes. Simply input your spell attack roll modifier as the “Attack Bonus” and the spell’s damage for the damage fields. The core math is the same.

Q: What about resistances and weaknesses?

A: This calculator determines the raw expected damage. You must apply any relevant resistances or weaknesses to the final numbers yourself.

Q: How do I handle abilities like Power Attack?

A: For abilities that modify an attack, you must manually adjust the inputs. For Power Attack, you would subtract its penalty from your attack bonus and add its extra damage dice to the damage fields.

Q: Is a natural 20 always a critical hit?

A: A natural 20 increases the degree of success by one step. If your roll would have been a success, it becomes a critical success. If it would have been a failure, it becomes a success. This calculator simplifies this by baking the probabilities into the final result.

Q: Where can I find character sheets to track these stats?

A: You can find official and fan-made versions of a pathfinder character sheet on various online platforms and communities.

Related Tools and Internal Resources

To further optimize your Pathfinder 2e experience, check out these other resources:

• Pathfinder 2e DPR Calculator: A tool focused specifically on calculating Damage Per Round against various enemies.
• Pathfinder 2e Beginner’s Guide: A comprehensive guide for new players.
• Best PF2E Builds: In-depth analysis of powerful and effective character builds.
• Understanding PF2E Conditions: A deep dive into the various conditions and how they impact gameplay.
• PF2E Spell Tracker: A utility to help manage spell slots and durations.
• PF2E Action Economy Guide: An article explaining the core three-action system.