How to Use the TCG Collection Completion Cost Calculator
If you play trading card games, you've probably felt the urge to complete the full set — and noticed that the closer you get, the more often you pull cards you already own. This calculator applies the classic "coupon collector's problem" from probability theory to estimate how many pulls, packs, and dollars you'll need on average to finish the remaining cards.
When you own only a small share of the set, almost every pack brings something new. But once you pass roughly 90% completion, the math changes dramatically. The chance of pulling any specific missing card keeps shrinking, so collectors often spend more than half their total budget chasing the last handful of cards.
Keep in mind this is a probabilistic average, not a guarantee — your actual results could finish much sooner or take considerably longer depending on luck. When budgeting, it's wise to add a buffer on top of the estimated cost.
Trading with other collectors or buying singles is often far more efficient than opening packs once you're chasing only a few cards. This calculator assumes you complete the set purely through pack purchases, so use it as a worst-case reference and consider trades first for those last stubborn cards.
Frequently Asked Questions
The more cards you already own, the lower the chance any given pack contains a new one. When only 1 card type is missing, you need to open roughly as many packs as there are total card types to get it.
Yes, this is a probabilistic average. Your actual result could finish much faster or take much longer depending on luck, so treat this number as a planning reference.