A standard credit card is 0.76 millimeters thick
The thickness of a credit card is set by an international standard called ISO/IEC 7810, which specifies that a card in the ID-1 format — the size of every major credit card — must be between 0.76 and 0.81 millimeters thick. Most cards land at the lower end of that range, right around 0.76 mm. That is roughly the thickness of three sheets of paper stacked together, or about the width of a paperclip wire.
This standard exists because card thickness affects how machines read them. ATMs, card readers at checkout counters, and chip readers all expect cards to fit within a narrow tolerance. A card that is too thick or too thin can jam the machine or fail to make proper contact with the reader. The standard has stayed consistent since the 1980s, which is why a card from 20 years ago and a card you receive today are virtually identical in thickness.
The thickness you feel in your wallet is not just plastic. Most credit cards are made of PVC (polyvinyl chloride) or a PVC blend, and that material is layered. The chip, if your card has one, adds a small amount of height on one side, but the overall card thickness remains within the standard range.
Key Takeaways
- Credit cards measure 0.76 to 0.81 millimeters thick, with most cards at the lower end of that range.
- The thickness standard (ISO/IEC 7810) ensures cards work in ATMs, card readers, and chip terminals without jamming.
- A card with an embedded chip is still the same overall thickness as a non-chip card, because the chip sits flush within the card body.
- Damaged or warped cards that deviate from the standard thickness may not read properly in machines and should be replaced.
Why the standard thickness matters for your card to work
Card readers are built to a tight specification. When you insert your card into an ATM or a chip reader, the machine expects the card to slide in smoothly and stop at a precise point. If your card is even slightly thicker than the standard, it can catch or jam. If it is thinner, it may not make solid contact with the metal pins on a chip reader, and the transaction will fail.
This is why a bent or warped card often stops working in machines, even though the chip itself is fine. The machine cannot read it because the card no longer fits the expected dimensions. Replacing the card is usually the only fix.
The standard also protects the machines themselves. Retailers and banks invest in card readers that are calibrated for the ISO standard. A card that is out of spec can damage the reader or cause it to malfunction, which is expensive to repair and inconvenient for other customers.
How chip cards stay within the thickness standard
Modern credit cards with embedded chips are still 0.76 mm thick overall, even though the chip itself adds material. The chip is embedded into the card body rather than sitting on top of it. During manufacturing, a small pocket is routed into the card, the chip is placed inside, and then the card is sealed. The result is a card that meets the standard thickness and has a chip that sits flush with the surface.
Older magnetic-stripe cards had no chip, so the entire card was uniform plastic. Chip cards have a small raised rectangle on one side where the chip contacts are exposed, but this does not change the overall thickness of the card itself. The chip contact area is designed to protrude slightly so it can make contact with the reader, but the card body remains at the standard thickness.
What happens if your card is too thick or too thin
A card that is out of spec will usually fail in one of two ways. First, it may jam in a machine — the card gets stuck partway in and the machine cannot pull it back out or push it through. This is frustrating and sometimes requires a technician to retrieve the card. Second, the card may not make proper electrical contact with the reader, so the transaction fails even though the card is not physically stuck.
Cards become out of spec through damage. A card that has been bent, sat on, or exposed to heat can warp or crack. Even a small warp is enough to push the card outside the tolerance range. If your card no longer works in machines, thickness is one of the first things to check — hold it up to the light and look for bends or warping. If you see any, contact your card issuer and request a replacement.
Manufacturing defects are rare but possible. If a brand-new card does not work in any machine, contact your bank when ready. They can issue a replacement and investigate whether the card was defective.
How credit card thickness compares to other cards you carry
A credit card is thinner than most other cards in your wallet. A driver's license is typically 0.76 mm as well — the same standard — but a gift card or hotel key card is often slightly thicker, around 0.84 to 1.0 mm. A library card or membership card can vary widely. Business cards are much thinner, usually around 0.25 mm.
The reason credit cards and ID cards share the same standard is that they need to work in the same machines. A driver's license goes into the same card readers that process credit cards in some contexts, so they have to be compatible. Gift cards and hotel cards do not need to work in ATMs or standard payment terminals, so they have more flexibility in thickness.
Why you should not try to make your card thicker or thinner
Some people try to modify their cards — adding stickers, laminating them, or sanding them down — thinking it will improve durability or appearance. Do not do this. Any modification that changes the card thickness will make it incompatible with card readers. The card will not work, and you will need a replacement anyway.
The plastic and materials used in credit cards are also designed to work together. Adding layers or removing material can damage the chip, degrade the magnetic stripe (if your card still has one), or weaken the card structure. A modified card is also more likely to jam in machines, which can damage the reader and create problems for other customers.
If you want a more durable card, ask your issuer whether they offer a metal card or a reinforced plastic card. Some banks offer these as premium options. They are still manufactured to the ISO standard thickness, so they work in all machines.
Frequently Asked Questions
Is 0.76 mm the same thickness for all credit cards?
Most credit cards are 0.76 mm, but the standard allows up to 0.81 mm. The exact thickness depends on the card issuer and the materials they use. The difference is small enough that you cannot feel it by hand, and all cards within the standard range work in the same machines.
Why does my card feel thicker than it looks?
A credit card is very thin, so the thickness is hard to judge by eye. It feels thicker than it looks because your fingers are sensitive to small differences in texture and rigidity. The card is also stiff plastic, which makes it feel more substantial than a piece of paper of the same thickness would.
Can I use a card that is slightly bent if it still works in machines?
If your card works now, you can keep using it, but a bent card will eventually fail. The bend puts stress on the chip and the card material. Replace it sooner rather than later to avoid getting stuck without a working card when you need it most.
Do metal credit cards work in all the same machines as plastic cards?
Metal cards are manufactured to the same ISO thickness standard as plastic cards, so they work in chip readers and ATMs. However, some older magnetic-stripe readers may have trouble reading metal cards because the magnetic stripe does not work the same way on metal. Most modern machines use chip technology, so this is rarely a problem.
What is the thickness of a card with a hologram or special coating?
Cards with holograms, special coatings, or textured surfaces are still manufactured to meet the 0.76 to 0.81 mm standard. The coating or hologram is applied in a way that does not add significant thickness to the overall card. If a specialty card is thicker than the standard, it will not work properly in machines.