Pokémon
Odds Guide
A number like 1 in 250 packs sounds precise, but it does not mean you will hit the card by pack 250. It only describes the average odds of one pack at a time, which is why real pack opening can feel much swingier than people expect.
It means each pack has a small independent chance of containing the target card. It does not mean the card is scheduled to appear once in every block of packs you open.
If a card is about 1 in 250 packs, you can still miss far longer than that, or get lucky much sooner.
Most people naturally read odds as if they guarantee a hit after enough tries. They do not. The risk stays real every time you open another pack.
That is why a chase can feel close when you are ten packs in, even if the actual hit chance is still low.
Expectation is the long-run average. Probability is the chance of hitting by a chosen pack count. They answer different questions.
HiddenSnags keeps both visible because 'expected packs needed' and 'chance after N packs' are not the same thing.
Pick the exact card you want first. Then compare the card's single price, the expected chase cost, and the hit chance after your real pack budget.
If you would be unhappy missing after that many packs, buying the single is usually the cleaner decision.
Next links
Use these pages to move from general advice into a real set, card, or calculator decision.