Pokemon Bdsp Catch Rate Calculator

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Pokémon BDSP Catch Rate Calculator

Calculate your capture probability in Brilliant Diamond & Shining Pearl

Legendaries are usually 3, common mons are 255.
Poké Ball / Premier Ball (1x) Great Ball (1.5x) Ultra Ball (2x) Net Ball (Water/Bug) (3x) Dusk Ball (Night/Cave) (3.5x) Quick Ball (Turn 1) (4x) Repeat Ball (Already Caught) (8x) Master Ball (Guaranteed)
None (1x) Asleep / Frozen (2.5x) Paralyzed / Poisoned / Burned (1.5x)

Estimated Success:

0%

Understanding Catch Rates in BDSP

In Pokémon Brilliant Diamond and Shining Pearl (BDSP), catching a Pokémon isn't just luck. It's determined by a specific mathematical formula that considers the Pokémon's health, its base catch rate, the ball you're using, and any status conditions applied.

How the Calculation Works

The core formula for the "Capture Value" (represented as a) is:

a = [ ((3 * MaxHP – 2 * CurrHP) * BaseRate * BallBonus) / (3 * MaxHP) ] * StatusBonus

If a is 255 or higher, the Pokémon is guaranteed to be caught. If not, a secondary calculation determines the probability of each of the four "shakes" of the Poké Ball.

Key Factors for Success

  • The 1 HP Strategy: Using moves like False Swipe to bring a Pokémon down to 1 HP significantly increases the Capture Value.
  • Status Conditions: Sleep and Freeze provide a 2.5x multiplier, which is much more effective than Paralysis, Poison, or Burn (1.5x).
  • Ball Choice: In BDSP, Quick Balls are incredibly effective on the first turn (4x), while Dusk Balls are the best choice in caves or at night (3.5x).
  • Base Catch Rate: Every species has a fixed number. For example, Dialga and Palkia have a catch rate of 3, making them extremely difficult to catch without status and low HP.

Example: Catching Dialga or Palkia

If you are facing Dialga (Base Rate 3) at 1 HP with 100 Max HP, using an Ultra Ball (2x) while it is Asleep (2.5x):

  • Your Modified Catch Value (a) would be approximately 14.8.
  • This translates to roughly a 15-18% chance per throw.
  • Without the status condition and at full health, that chance drops to below 1%.
function calculateCatchRate() { var maxHp = parseFloat(document.getElementById('maxHp').value); var currHp = parseFloat(document.getElementById('currHp').value); var baseRate = parseFloat(document.getElementById('baseRate').value); var ballBonus = parseFloat(document.getElementById('ballBonus').value); var statusBonus = parseFloat(document.getElementById('statusBonus').value); // Validation if (isNaN(maxHp) || isNaN(currHp) || isNaN(baseRate) || maxHp maxHp) { alert("Current HP cannot be higher than Max HP."); return; } // Special Case: Master Ball if (ballBonus >= 255) { document.getElementById('resultArea').style.display = 'block'; document.getElementById('finalPercentage').innerHTML = "100%"; document.getElementById('finalPercentage').style.color = "#4CAF50"; document.getElementById('avgBalls').innerHTML = "Master Ball is a guaranteed catch!"; return; } // 1. Calculate the 'a' value (Capture Value) // Formula: a = (((3 * MaxHP – 2 * CurrHP) * Rate * Ball) / (3 * MaxHP)) * Status var term1 = (3 * maxHp) – (2 * currHp); var term2 = (term1 * baseRate * ballBonus) / (3 * maxHp); var a = term2 * statusBonus; var finalProb = 0; if (a >= 255) { finalProb = 100; } else { // 2. Calculate 'b' value for the shake checks // b = 65536 / (255 / a)^0.25 var shakeCheck = 65536 / Math.pow((255 / a), 0.25); // 3. Probability of success is (shakeCheck / 65536)^4 // because the game performs 4 shake checks. finalProb = Math.pow((shakeCheck / 65536), 4) * 100; } // Display Results document.getElementById('resultArea').style.display = 'block'; document.getElementById('finalPercentage').innerHTML = finalProb.toFixed(2) + "%"; // Color coding if (finalProb > 75) { document.getElementById('finalPercentage').style.color = "#4CAF50"; } else if (finalProb > 25) { document.getElementById('finalPercentage').style.color = "#FF9800"; } else { document.getElementById('finalPercentage').style.color = "#e3350d"; } // Average balls needed if (finalProb > 0) { var avgBalls = Math.ceil(100 / finalProb); document.getElementById('avgBalls').innerHTML = "Expected average: " + avgBalls + " ball(s) to succeed."; } else { document.getElementById('avgBalls').innerHTML = "Probability too low to estimate."; } }

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