Gen I Catch Rate Calculator

Other catch rate calculators: Gen II, Gen III/IV, Gen V, Gen VI/VII, Gen VIII, Gen IX

Calculate your chances of capturing a Pokémon in R/B/Y at a given status and health with a given ball using this tool. If you're curious about how this works, see the Gen I Capture Mechanics page.

Game:



Approximation of current HP:



If checked, you will see the results for each possible HP IV if they would yield different results, along with the game's approximation of your chances in each case and how many times the ball is going to wobble if the capture fails (see the capture mechanics page); otherwise, you'll see the overall chance assuming you know nothing about the IV. This is only very meaningful at full or less than 1/3 HP, since the approximation of the Pokémon's current HP is not exact.

Page last modified March 6 2025 at 00:55 UTC

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146 Fun fact: The above sprite has a 1/8192 chance of being shiny. Feel free to brag if you get one.

Comments

My own messages will be signed as Butterfree, with the Admin label below my name. If someone signs as Butterfree without that label, it's probably not me.

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bill

idk either

» Reply to this [05/02/2025 18:57:44]
Butterfree
Admin
Website: The Cave of Dragonflies

The Ultra Ball has a lower catch rate than the Great Ball under certain conditions, such as when the Pokémon is at full health or has a high catch rate. Under other conditions, Ultra Balls are better. You can see the Gen I Capture Mechanics page for an explanation of how it works and the ability to generate graphs of how the odds of capture change for the different balls as you lower the Pokémon's HP.

» Reply to this [05/12/2024 18:23:52]
CatGamesNL

So the ultra ball has a lower catch rate than the great ball in gen 1? or is it miswritten?

» Reply to this [05/12/2024 05:32:44]

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