In the Pokémon TCG, six of your cards start the game face-down as prizes — and if a one-of you need is among them, your whole plan can stall. This calculator uses the hypergeometric distribution to tell you exactly how likely it is that one or more copies of a card get prized, so you can judge how many copies a critical card really needs.
How it works
The six prizes are a random sample drawn without replacement from your deck, so the number of copies
of a card that land in the prizes follows the hypergeometric distribution. With deck size N, prize
count P, and K copies of the card, the probability that exactly k are prized is:
P(X = k) = C(K, k) * C(N - K, P - k) / C(N, P)
From this the tool reports:
- At least one prized — one minus the probability that zero copies are prized.
- None prized — the
k = 0term, the happy case where every copy is in your deck. - All copies prized — the worst case, where the card is unavailable all game until you take those prizes.
- Expected number prized — the mean of the distribution, equal to
K * P / N.
Example and notes
A single copy of a card in a 60-card deck with 6 prizes has exactly a 10% chance of being prized (6/60). Run two copies and the chance that both are prized falls to under 1%, while the chance that at least one is prized rises to about 19%. The expected number prized for that two-of is 0.2 cards.
Worth keeping in mind:
- Higher prize risk on a must-have card is a strong argument for running more copies or adding search effects that can dig past prizes.
- Some cards let you look at or recover prizes; this calculator measures the starting risk before any such effect.
- Pair this with the Pokémon Draw Probability calculator to balance how easily you draw a card against how often it gets prized.