Catch Rate Calculator Gen 5

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Advanced Catch Rate Calculator Gen 5


Professional Pokémon Tools

Catch Rate Calculator Gen 5

An advanced tool to determine your exact capture probability in Pokémon Black, White, Black 2, and White 2. This catch rate calculator gen 5 uses the precise in-game formula for maximum accuracy.


Enter the species’ base catch rate (e.g., Reshiram is 3, Patrat is 255).
Please enter a number between 1 and 255.


The Pokémon’s maximum HP.
Please enter a valid, positive HP value.


Slide to represent the Pokémon’s remaining health. Lower is better!


Select the ball you are using. Some have conditional multipliers.


Status conditions significantly improve capture odds.


Final Catch Probability

15.34%

Modified Rate ‘a’
38.96
Shake Probability
62.53%
Guaranteed Catch?
No

Formula Used: This calculator uses the Gen 5 catch formula. First, a modified rate ‘a’ is calculated based on HP, catch rate, ball, and status. Then, a “shake probability” is found. The final catch chance is this shake probability to the 4th power, as the Pokémon must pass four separate “shake checks” to be caught.

Catch Rate Comparison by Status 0% 50% 100% None Paralyzed Asleep

Dynamic chart showing how different status conditions affect the final catch probability with the current settings.

Poké Ball Multiplier Best Use Case
Poké Ball 1x General purpose, early game
Great Ball 1.5x A solid upgrade for tougher Pokémon
Ultra Ball 2x The standard for difficult captures
Quick Ball 5x Extremely effective on the very first turn of battle
Dusk Ball 3.5x Powerful at night or inside caves
Master Ball 255x Guarantees capture, bypassing the formula

A reference for common Poké Ball multipliers in Generation 5.

What is a catch rate calculator gen 5?

A catch rate calculator gen 5 is a specialized digital tool designed for players of the Pokémon Black, White, Black 2, and White 2 video games. Its purpose is to compute the precise probability of successfully capturing a wild Pokémon. Unlike simple guesswork, it uses the exact mathematical formula hardcoded into the Generation 5 games. By inputting variables such as the Pokémon’s species, its current health, the type of Poké Ball used, and any active status conditions, players can see their exact percentage chance of a successful capture. This allows for strategic planning, resource management, and a deeper understanding of the game’s mechanics. Anyone from a casual player wondering if they should use their last Ultra Ball to a dedicated shiny hunter trying to optimize their strategy can benefit from a reliable catch rate calculator gen 5.

A common misconception is that catch rates are purely random. While there is a random element, it’s governed by a strict probability formula. Another mistake is assuming all generations use the same formula; Generation 5 introduced specific changes, like boosting the effectiveness of Sleep status, making a dedicated catch rate calculator gen 5 essential for accuracy.

Catch Rate Calculator Gen 5 Formula and Mathematical Explanation

The capture mechanic in Pokémon Generation 5 is a multi-step process. The core of the calculation determines a value, commonly referred to as ‘a’, which is then used to find the probability of the Poké Ball shaking without breaking. Since a capture requires four successful shakes, this probability is key. Our catch rate calculator gen 5 automates this for you.

The formula to calculate ‘a’ is:

a = (((3 * MaxHP - 2 * CurrentHP) * CatchRate * BallBonus) / (3 * MaxHP)) * StatusBonus

If ‘a’ is 255 or greater, the capture is guaranteed. Otherwise, the game calculates a “shake probability” value, ‘b’:

b = 65536 / (255 / a)^0.25

For each of the four shake checks, the game generates a random number between 0 and 65535. If the random number is less than ‘b’, the check passes. Therefore, the probability of passing a single shake check is b / 65536. The final capture probability is the chance of passing all four checks in a row:

Final Catch Probability = (b / 65536) ^ 4

Variable Explanations
Variable Meaning Unit Typical Range
MaxHP The target Pokémon’s maximum Health Points. Points 10 – 714
CurrentHP The target Pokémon’s current Health Points. Points 1 – MaxHP
CatchRate The base catch rate of the Pokémon species. Index 3 (Legendaries) – 255 (Common)
BallBonus The multiplier of the Poké Ball being used. Multiplier 1x – 5x (excluding Master Ball)
StatusBonus The multiplier for a status condition. Multiplier 1x (None), 1.5x (Paralyze/Burn/Poison), 2.5x (Sleep/Freeze)

Practical Examples (Real-World Use Cases)

Example 1: Capturing a Legendary Pokémon (e.g., Kyurem)

Imagine you are trying to catch Kyurem in the Giant Chasm. Kyurem is at Level 75 with a Max HP of 200 and you’ve whittled its health down to 1 HP using False Swipe. You’ve also put it to sleep.

  • Inputs for catch rate calculator gen 5:
    • Base Catch Rate: 3 (Very Low)
    • Max HP: 200
    • Current HP: 1
    • Poké Ball: Ultra Ball (2x Bonus)
    • Status Condition: Asleep (2.5x Bonus)
  • Results:
    • The ‘a’ value is approximately 15.
    • The single shake probability is about 50%.
    • The final catch probability is around 6.2% per Ultra Ball.
  • Interpretation: Even under these ideal conditions, catching Kyurem is difficult. The catch rate calculator gen 5 shows that you should be prepared to throw many Ultra Balls.

Example 2: Catching a Common Pokémon (e.g., Lillipup)

Now, consider finding a Lillipup on Route 1. It’s at Level 3 with 15 Max HP. You toss a standard Poké Ball at it when it has full health and no status condition.

  • Inputs for catch rate calculator gen 5:
    • Base Catch Rate: 255 (Very High)
    • Max HP: 15
    • Current HP: 15
    • Poké Ball: Poké Ball (1x Bonus)
    • Status Condition: None (1x Bonus)
  • Results:
    • The ‘a’ value is approximately 85.
    • The single shake probability is about 75.8%.
    • The final catch probability is approximately 33.1% per Poké Ball.
  • Interpretation: The catch rate calculator gen 5 confirms that even at full health, common Pokémon with high catch rates are relatively easy to catch. Damaging it slightly or using a better ball would make it almost certain.

How to Use This Catch Rate Calculator Gen 5

  1. Enter Base Catch Rate: Find the Pokémon’s species catch rate online (Bulbapedia is a great resource) and enter it.
  2. Set HP Values: Input the Pokémon’s maximum HP. Then, use the slider to approximate its current health percentage. The lower the health, the better your chances.
  3. Select Poké Ball: Choose the ball you are using from the dropdown menu. This will apply the correct multiplier.
  4. Apply Status Condition: If the Pokémon is asleep, paralyzed, or otherwise afflicted, select the correct status condition to see its powerful effect on the catch rate.
  5. Read the Results: The calculator instantly updates. The large percentage is your final capture chance for that single throw. The intermediate values show the underlying mechanics, and the chart provides a visual comparison of how status effects could improve your odds. Using this catch rate calculator gen 5 effectively can save you time and in-game money.

Key Factors That Affect Catch Rate Calculator Gen 5 Results

  • Health Points: The single most impactful factor you control. The lower the Pokémon’s current HP is relative to its maximum, the higher the catch rate. A Pokémon at 1 HP is far easier to catch than one at 50% HP.
  • Base Catch Rate: An unchangeable value inherent to each Pokémon species. Legendary Pokémon have extremely low rates (e.g., 3), while common Pokémon have very high rates (e.g., 255). This is the primary determinant of a Pokémon’s difficulty.
  • Status Conditions: Applying a status condition is a massive advantage. In Gen 5, Sleep and Freeze are the best, providing a 2.5x multiplier to the formula. Paralyze, Burn, and Poison provide a 1.5x boost. This is a critical strategy for any difficult capture.
  • Poké Ball Type: Different Poké Balls have different multipliers. An Ultra Ball (2x) is twice as effective as a regular Poké Ball (1x). Situational balls like the Quick Ball (5x on turn 1) or Dusk Ball (3.5x at night) offer huge advantages when their conditions are met.
  • The ‘a’ Value Cap: The modified catch rate ‘a’ is capped at 255. If the combination of low HP, a good ball, and a status condition pushes ‘a’ to 255 or higher, the capture becomes guaranteed. Our catch rate calculator gen 5 will indicate when this happens.
  • Mathematical Power: The final step of the formula involves raising the shake probability to the power of 4. This means even a small increase in the initial ‘a’ value can lead to a significant increase in the final catch probability, as the benefit is compounded across four checks.

Frequently Asked Questions (FAQ)

Does the Pokémon’s level matter in the catch rate calculator gen 5?
In Generation 5, the Pokémon’s level does *not* directly affect the general catch rate formula. However, it is a factor in the Max HP calculation, and some specific balls like the Nest Ball (not included in this simplified calculator) do depend on level.
Is a Critical Capture included in this calculator?
This catch rate calculator gen 5 calculates the probability of a *normal* capture. Critical captures are a separate, random mechanic that can make a catch much easier, but they happen independently of this main formula and have their own probability based on your Pokédex completion.
Why is Sleep better than Paralysis in Gen 5?
Generation 5 specifically increased the bonus for the Sleep and Frozen statuses to 2.5x, while leaving Paralyze, Burn, and Poison at 1.5x. This was a change from previous generations and makes Sleep the superior status for capturing Pokémon.
Why does my catch rate seem higher/lower than what the calculator says?
Probability isn’t a guarantee. A 10% chance doesn’t mean you’ll catch it on the 10th ball. It means that over thousands of attempts, you would average one success for every ten throws. Short-term luck (both good and bad) can make results vary wildly from the statistical probability shown by the catch rate calculator gen 5.
Can I use this calculator for other Pokémon games?
No. This calculator is specifically tuned for the Generation 5 (Black, White, B2, W2) mechanics. Other generations use different formulas, different status bonuses, or have entirely different mechanics. For example, the formula in Gen 1 was completely different.
What’s the best strategy for catching legendaries?
Use a move like False Swipe to get the Pokémon to 1 HP. Then, apply the Sleep status condition using a move like Spore or Hypnosis. Finally, throw Dusk Balls (if at night/in a cave) or Timer Balls (if the battle has gone on for many turns). This maximizes every multiplier in the formula.
Does the catch rate calculator gen 5 account for all ball types?
This calculator includes the most common and impactful Poké Balls for general use. It does not include highly specialized balls like the Nest Ball, Repeat Ball, or Heavy Ball, which have more complex conditional logic based on level, Pokédex registration, or weight.
Is it possible to have a 0% chance of capture?
In theory, yes, if the resulting shake probability is so low that it rounds to zero. In practice, for any catchable Pokémon, there is always a non-zero, albeit sometimes astronomically small, chance of capture. The only true 0% chance is against specific uncatchable “ghost” Pokémon in story events.

If you found our catch rate calculator gen 5 useful, check out these other resources:

© 2026 Pro Pokémon Tools. Pokémon and all related names are trademarks of Nintendo. This is a fan-made tool.



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