Standard card sleeve size: the real numbers

A standard card sleeve measures 66x91mm. That's the size built to hold a 63x88mm card, the dimensions shared by Magic: The Gathering, Pokemon, One Piece Card Game, Disney Lorcana, and Flesh and Blood. The extra room, roughly 3mm on each side, is what lets a card slide in cleanly without tearing the seam or rattling loose once it's seated.

Why the sleeve is bigger than the card

A sleeve that matched the card's exact dimensions would be useless. You'd tear it open on the first insertion, and shuffling would wear through the seams within a few games. The companies behind every major sleeve line settled on roughly the same clearance: enough to let the card glide in and out but not so much that it flops around and catches foils on the inner plastic. That's why 66x91mm shows up across nearly every brand that makes a standard-size sleeve, whether it's built for tournament play or casual binder duty.

The size, brand by brand

Here's what "standard size" actually measures once you check the spec sheet instead of the marketing copy:

Most of the field lands within a millimeter of 66x91mm. Penny sleeves run a touch bigger on purpose. They're meant to hold a raw card loosely for storage or to slide into a toploader, not to grip it for shuffling, so a little extra slack is the point rather than a flaw.

Inner sleeves are a different size on purpose

If you double sleeve, the inner layer isn't a standard sleeve at all. Brands like Dragon Shield Perfect Fit, KMC Perfect Fit, Ultra Pro PRO-Fit, and Gamegenic Inner Sleeves all measure 64x89mm, a snug 1mm of clearance built to sit directly against the card with almost no play. That tight fit is what lets you swap the outer sleeve for a fresh one without ever touching the card again. If you're setting up a double-sleeve stack for the first time, our guide on how to double sleeve cards walks through the order and the air-pocket problem that trips up most people the first time.

What about sports cards and Yu-Gi-Oh?

Sports cards and poker cards run 63.5x88.9mm, close enough to the 63x88mm standard that they sit fine in the same 66x91mm sleeves. Yu-Gi-Oh!, Cardfight!! Vanguard, and Weiss Schwarz are a different story. Those cards measure 59x86mm, small enough that a standard sleeve leaves the card sliding around inside. If you play any of those, you want a Japanese-size sleeve instead, and we cover the full breakdown in Japanese size sleeves vs standard.

For the complete rundown of every game and which sleeve size to actually buy, see the card sleeve size chart. And if you already own sleeves and just want to know whether your specific deck box or binder combo works, the fit checker will tell you in one search instead of a spreadsheet.

Quick answers

Is there really just one "standard" sleeve size? Close to it. Every major brand's standard-size sleeve lands within a millimeter of 66x91mm, built for the 63x88mm card used by Magic, Pokemon, One Piece, Lorcana, and Flesh and Blood. The small brand-to-brand differences (KMC runs a hair taller, Vault X's board game line a hair narrower) don't change which cards fit; they change how tight the shuffle feels.

Are penny sleeves the same size as deck sleeves? No, and that's by design. Penny sleeves measure closer to 66.7x92.1mm, a bit roomier than a shuffle sleeve because they're meant to hold a card loosely for storage or inside a toploader, not to be shuffled game after game.

Do standard sleeves fit Japanese-size cards like Yu-Gi-Oh? Not well. A 66x91mm sleeve on a 59x86mm card leaves several millimeters of dead space, enough that the card visibly shifts inside.

How much bigger is a sleeve than the card, in one number? About 3mm on each dimension for the vast majority of standard sleeves. That's the sweet spot between tearing on the first shuffle and being loose enough to spin.

Sleeve sizing looks complicated until you line up the numbers, and then it's just two categories: standard and small. Know which one your game uses and the rest of the shopping list sorts itself out.