Arknights Recruitment Calculator

Estimate your chances of getting specific star-rated Operators from Headhunting.

Recruitment Probability Calculator

Recruitment Results

Base 6-Star Rate: – %

Base 5-Star Rate: – %

Base 4-Star Rate: – %

Bonus Rate per Tag: – %

Total Bonus Rate: – %

Effective 6-Star Rate: – %

Effective 5-Star Rate: – %

Effective 4-Star Rate: – %

Effective 3-Star Rate: – %

Calculation Basis: Standard Arknights recruitment probabilities are adjusted by the number of tags selected and the guaranteed 4-star bonus. The base rates are typically 5% for 6-star, 25% for 5-star, and 70% for 4-star. Each tag selected after the first can add a small bonus to the chance of higher rarity operators. The guaranteed 4-star bonus affects rates for 3-star and 4-star+ operators.

Probability Table for Recruitment Tags

Operator Star Rate Probabilities (Approximate)

Operator Star Rate	Base Probability	Max Probability (with 5 tags & guaranteed 4*)	Guaranteed 4* Bonus
6-Star	5.0%	~15-20% (Varies greatly with tags)	No direct bonus, but prevents 3-star
5-Star	25.0%	~40-50% (Varies greatly with tags)	No direct bonus, but prevents 3-star
4-Star	70.0%	~35-45% (Can be lower due to 6*/5*)	Guaranteed (If not met by higher rarities)
3-Star	0.0%	~5-10% (Only if 4-star is not guaranteed)	Effectively eliminated by guaranteed 4*

Note: Probabilities are approximate and can be influenced by specific tag combinations. The guaranteed 4-star bonus means if the recruitment doesn't yield a 5-star or 6-star, it will be a 4-star.

What is the Arknights Recruitment Calculator?

The Arknights Recruitment Calculator is a tool designed to help players of the popular mobile game Arknights estimate the probabilities of recruiting operators of different star rarities. Arknights features a headhunting system where players can recruit units using in-game currency or headhunting permits. While certain tag combinations can guarantee specific operators or rarities, the overall chances for higher-star units (5-star and 6-star) are relatively low. This calculator takes the standard base probabilities and factors in common recruitment choices, such as the number of tags selected and the use of the "Guaranteed 4-Star" recruitment option, to provide a clearer picture of your potential outcomes.

This tool is invaluable for players looking to optimize their recruitment efforts, understand the risks involved, and manage their in-game resources effectively. It helps demystify the gacha mechanics of Arknights recruitment, providing data-driven insights rather than relying on guesswork or anecdotal evidence.

Arknights Recruitment Formula and Explanation

Arknights recruitment probabilities are not a single fixed formula but rather a system influenced by several factors. The core probabilities are:

• 6-Star Operators: 5% base chance
• 5-Star Operators: 25% base chance
• 4-Star Operators: 70% base chance
• 3-Star Operators: 0% base chance (effectively)

However, these base rates are modified by:

1. Number of Tags Selected: Each tag selected beyond the first can slightly increase the chance of higher rarity operators. The exact bonus per tag is not publicly disclosed but is generally understood to be small.
2. Guaranteed 4-Star Recruitment: When this option is active, the game guarantees that the recruited operator will be at least a 4-star. If the initial roll doesn't result in a 5-star or 6-star, it will become a 4-star. This effectively shifts probabilities away from 3-star outcomes (which are already minimal) and redistributes them among the higher rarities, potentially increasing 4-star chances if 5/6-star rolls are not achieved.
3. Tag Combinations: Specific tag combinations can "lock" certain outcomes, guaranteeing a specific operator or rarity. This calculator focuses on the general probability without considering specific tag locks, as those are deterministic.

Simplified Calculation Logic:

The calculator approximates the effects. The "Guaranteed 4-Star" status acts as a baseline. If active, the chance of getting a 3-star is near zero. The base probabilities for 4-star, 5-star, and 6-star are then considered. The number of tags adds a small percentage bonus, primarily to the 6-star and 5-star pools. The calculator estimates these combined effects.

Variables Table

Arknights Recruitment Variables

Variable	Meaning	Unit	Typical Range
Target Star Rate	The desired rarity of the operator.	Star Rating (3, 4, 5, 6)	3 to 6
Selected Tags Count	The number of unique recruitment tags chosen.	Count (Unitless)	1 to 5
Guaranteed 4-Star Active	Whether the "Guaranteed 4-Star" option is enabled.	Boolean (Yes/No)	Yes or No
Base 6-Star Rate	The fundamental probability of rolling a 6-star.	Percentage (%)	5.0%
Base 5-Star Rate	The fundamental probability of rolling a 5-star.	Percentage (%)	25.0%
Base 4-Star Rate	The fundamental probability of rolling a 4-star.	Percentage (%)	70.0%
Bonus Rate per Tag	Estimated small probability increase per additional tag for higher rarities.	Percentage (%)	~0.5% – 2.0% (Estimated)

Practical Examples

Let's see how the Arknights Recruitment Calculator works with real scenarios:

Example 1: Standard Recruitment with Focus on a 6-Star

• Inputs: Target Star Rate: 6, Number of Selected Tags: 5, Guaranteed 4-Star: Yes
• Assumptions: We assume each of the 5 tags contributes a small bonus (e.g., 1.5% per tag) to the 6-star pool. The guaranteed 4-star ensures no 3-star result.
• Calculator Output (Approximate):
  • Chance for Target 6-Star: ~17.5%
  • Chance for Any 6-Star: ~17.5%
  • Chance for Any 5-Star: ~45.0%
  • Chance for Any 4-Star: ~37.5%
  • Chance for Any 3-Star: 0.0%
• Explanation: With 5 tags and the guaranteed 4-star option, the chances for a 6-star are significantly boosted beyond the base 5%, while the chance for a 5-star also increases considerably. The 4-star rate adjusts to fill the remaining probability.

Example 2: Seeking a Specific 5-Star without Guarantee

• Inputs: Target Star Rate: 5, Number of Selected Tags: 3, Guaranteed 4-Star: No
• Assumptions: Three tags provide a moderate bonus. No guarantee means 3-star operators are possible.
• Calculator Output (Approximate):
  • Chance for Target 5-Star: ~30.0%
  • Chance for Any 6-Star: ~6.0%
  • Chance for Any 5-Star: ~31.0%
  • Chance for Any 4-Star: ~63.0%
  • Chance for Any 3-Star: ~0.0% (This can be near 0% depending on the exact distribution)
• Explanation: Selecting 3 tags moderately increases the 5-star and 6-star chances. Without the guarantee, the 4-star probability is higher, and while 3-stars are technically possible, their base rate is so low they rarely appear unless specific conditions arise (which this calculator doesn't model).

Example 3: Focusing on a 4-Star with Guarantee

• Inputs: Target Star Rate: 4, Number of Selected Tags: 2, Guaranteed 4-Star: Yes
• Assumptions: Two tags offer a small bonus. Guarantee ensures 4-star or higher.
• Calculator Output (Approximate):
  • Chance for Target 4-Star: ~30.0% (This is specific to the target 4-star, not ANY 4-star)
  • Chance for Any 6-Star: ~8.0%
  • Chance for Any 5-Star: ~30.0%
  • Chance for Any 4-Star: ~62.0%
  • Chance for Any 3-Star: 0.0%
• Explanation: The guarantee ensures you won't get a 3-star. The 4-star rate here is the sum of the base 4-star rate plus any leftover probability after accounting for the increased chances of 5-star and 6-star operators due to tags. This calculator focuses on the *chance of getting the specific star rate you input*, not just any operator of that rate.

How to Use This Arknights Recruitment Calculator

Using the Arknights Recruitment Calculator is straightforward:

1. Select Target Star Rate: Choose the star rating (3, 4, 5, or 6) of the operator rarity you are most interested in obtaining.
2. Enter Number of Selected Tags: Input the quantity of distinct recruitment tags you plan to use. Typically, players aim for 3-5 tags to maximize their chances or target specific operators.
3. Activate Guaranteed 4-Star: Decide whether you will be using the "Guaranteed 4-Star (or higher)" option. Select "Yes" if you intend to use it, and "No" otherwise. This significantly alters the probability distribution.
4. Calculate Probabilities: Click the "Calculate Probabilities" button.
5. Interpret Results: The calculator will display the estimated percentage chance for your target star rate, as well as the probabilities for any 6-star, 5-star, 4-star, and 3-star operators. Intermediate values show the breakdown of base rates and bonuses.
6. Copy Results: Use the "Copy Results" button to save the calculated probabilities and assumptions for later reference.

Selecting Correct Units: In this calculator, "units" are not applicable in the traditional sense (like currency or weight). The primary metrics are star ratings (unitless integer values) and percentages. Ensure you understand what each percentage represents: the chance of obtaining *at least* that star rarity.

Key Factors That Affect Arknights Recruitment Odds

1. Base Probabilities: The fundamental 5% for 6-star, 25% for 5-star, and 70% for 4-star are the bedrock of all calculations. These are set by the game developers.
2. Number of Tags: More tags generally mean a higher chance for rarer operators. Each tag selected beyond the first can contribute a small bonus. Aiming for 5 tags is common for maximizing potential.
3. Guaranteed 4-Star Option: Activating this safety net prevents 3-star outcomes, concentrating possibilities into 4-star and higher tiers. It's crucial for players avoiding the lowest rarities.
4. Specific Tag Combinations: While this calculator focuses on general odds, knowing that certain tags (like "Senior Operator," "Medic," "Guard," etc.) can guarantee specific operator types or even specific operators is key to advanced recruitment planning. This calculator doesn't predict tag locks.
5. Limited Banners: Special headhunting banners may have slightly altered rates or feature pools, but the core mechanic of probability adjustment based on tags and guarantees remains similar.
6. Operator Pool Size: The total number of operators available within each rarity tier influences the chance of pulling a *specific* operator within that tier. This calculator focuses on the chance of pulling *any* operator of a given rarity.

FAQ

Q1: What are the exact base rates for Arknights recruitment?

A1: The generally accepted base rates are 5% for 6-star, 25% for 5-star, and 70% for 4-star operators. 3-star operators are practically non-existent unless specific circumstances override the standard rates.

Q2: How much does each additional tag increase the probability?

A2: The exact bonus percentage per tag is not officially disclosed by Hypergryph. This calculator uses an estimated range based on community observations. It's a small but noticeable boost.

Q3: Is it better to use the "Guaranteed 4-Star" option?

A3: It depends on your goals. If you want to minimize the risk of getting a 3-star and ensure you get at least a decent operator, "Yes" is better. If you are willing to risk getting a 3-star for a slightly higher theoretical chance at a 6-star without the guarantee, then "No" might be considered, but generally, the guarantee is beneficial.

Q4: Can this calculator predict which specific operator I will get?

A4: No, this calculator estimates the probability of obtaining an operator of a certain *star rarity*. It does not predict specific operator drops, as those depend on the current operator pool and tag combinations that might guarantee certain units.

Q5: What happens if I select the same tag multiple times?

A5: In Arknights, you select *distinct* tags. Selecting the same tag description multiple times does not count as multiple tags for probability calculations; it simply confirms that specific tag is used.

Q6: How do "specialist" tags like "Senior Operator" affect things?

A6: Tags like "Senior Operator" are special statuses that guarantee a 5-star or 6-star operator. If you obtain such a tag, your recruitment is guaranteed to be at least 5-star, overriding the standard probability calculations for that specific recruitment.

Q7: Are these probabilities the same for all banners (Standard, Event, Headhunting)?

A7: The base probabilities (5/25/70) are generally consistent. However, event banners might have boosted rates for featured operators or a different operator pool, potentially altering the odds of getting a *specific* operator within a rarity tier. This calculator uses the standard rates.

Q8: What is the effective difference between selecting 3 tags and 5 tags?

A8: Selecting 5 tags provides a greater bonus percentage to the higher rarity pools (5-star and 6-star) compared to just 3 tags. This can noticeably increase your chances of pulling top-tier operators over time.