Introduction
A hotel key card is not a proprietary size. It is a CR80 card — the same format as a credit card, standardised internationally as ISO/IEC 7810 ID-1 and measuring 85.60 mm × 53.98 mm, about 0.76 mm thick.
That single fact answers most sizing questions before they are asked. Because the card is a standard, the holders, sleeves, and folders that carry it are built to standard clearances too — and mismatches happen when a buyer specifies a holder without checking those clearances against the actual card.
This guide covers the CR80 dimensions, how other ISO card formats compare, how a card's size translates into pocket dimensions, and what the tolerance numbers mean in a real production run.
The Standard Behind Hotel Key Cards
Hotel key cards — whether magnetic stripe or RFID — follow the same physical standard as payment cards.
| Property | Specification |
|---|---|
| Common name | CR80 |
| ISO standard | ISO/IEC 7810, ID-1 format |
| Width | 85.60 mm (3.370 in) |
| Height | 53.98 mm (2.125 in) |
| Thickness | ~0.76 mm (0.030 in) |
| Also used by | Credit cards, ID badges, gift cards, loyalty cards |
The reason the format matters commercially is compatibility: because the card is standard, a holder made for one hotel's key works for another's, and a property can change card suppliers without re-specifying its holders.
CR80 Dimensions in Detail
The two dimensions are frequently written in the wrong order, so it is worth anchoring them.
| Measurement | Value |
|---|---|
| Long edge (width) | 85.60 mm / 3.370 in |
| Short edge (height) | 53.98 mm / 2.125 in |
| Aspect ratio | ~1.586 : 1 |
| Corner radius | Rounded, per ID-1 specification |
A quick sanity check: the long edge is roughly 85 mm, not 54 mm. A card described as "54 × 86 mm" has the dimensions reversed — the measurements happen to be close to correct, but a pocket cut to that description will not hold the card.
| Written As | Correct? |
|---|---|
| 85.60 × 53.98 mm | Yes — long edge first |
| 3.370 × 2.125 in | Yes |
| 54 × 86 mm | Reversed — misreading |
| 86 × 54 mm | Rounded, order ambiguous |
Other ISO Card Formats Compared
CR80 is one of several formats defined by the same standard, and knowing the others prevents ordering the wrong holder.
| Format | Dimensions | Typical Use |
|---|---|---|
| ID-000 | 25 × 15 mm | SIM cards |
| ID-1 (CR80) | 85.60 × 53.98 mm | Credit cards, hotel key cards |
| ID-2 | 105 × 74 mm | Larger ID cards, older access badges |
| ID-3 | 125 × 88 mm | Passport data pages |
Only ID-1 is relevant to hotel key holders in normal use. The others appear when a property uses a non-standard access system, or when a membership programme issues a larger card.
| If your card is… | Format | Holder family |
|---|---|---|
| A standard key card | ID-1 / CR80 | Standard holders, sleeves, folders |
| A large access badge | ID-2 | Larger holder, or card-sized pouch |
| A SIM-sized chip card | ID-000 | Not a holder application |
| A passport-style document | ID-3 | Document enclosure, not a key holder |
From Card Size to Holder Size
A holder is not sized to the card — it is sized to the card plus clearance.
| Element | Dimension | Purpose |
|---|---|---|
| Card (CR80) | 85.60 × 53.98 mm | The item held |
| Pocket width | 88–92 mm | 2.4–6.4 mm clearance |
| Pocket height | 57–62 mm | 3–8 mm clearance |
| Thumb exposure | 6–8 mm of card left visible | So the card can be pulled out |
The height clearance is deliberately larger than the width clearance, because the card has to be retrievable, not just insertable. A pocket that matches the card height exactly will hold it perfectly and release it never.
| Pocket Design | Effect |
|---|---|
| Too tight | Card catches, corner damage, torn pocket |
| Correct | Slides in and out with light friction |
| Too loose | Card slides out in a pocket or bag |
Pocket Tolerances
Tolerance is the amount of variation a specification allows, and it is where batch problems originate.
| Specification | Nominal | Acceptable Range |
|---|---|---|
| Pocket width | 90 mm | 88–92 mm |
| Pocket height | 60 mm | 57–62 mm |
| Card thickness | 0.76 mm | Per ID-1 tolerance |
| Pocket depth (single) | 1 card | Flat pocket |
| Pocket depth (dual) | 2 cards | ~1.6 mm stack |
Why a range rather than a single figure:
| Reason | Effect |
|---|---|
| Die-cutting variation | Cut position shifts slightly across a run |
| Paper stretch | Stock moves as it passes through the press |
| Humidity | Paper dimension changes with moisture |
| Card tolerance | The card itself varies within ID-1 limits |
Two tolerances combine here — the card's and the pocket's — so a pocket designed at the tight end of its range can fail against a card at the large end of its own.
Thickness and Clearance
Thickness matters less for a single card and more as soon as a second card is involved.
| Configuration | Stack Thickness | Consideration |
|---|---|---|
| Single card | ~0.76 mm | Flat pocket is sufficient |
| Two cards | ~1.52 mm | Pocket needs depth or a second slot |
| Card plus insert | 0.76 mm + insert | Depends on insert |
Dual-card holders solve this either with two separate slots or with a wider single pocket:
| Design | Advantage |
|---|---|
| Two slots | Cards stay separated, no stripe contact |
| One wide pocket | Faster to load at check-in |
| Staggered slots | Both cards visible at once |
What Goes Wrong When Tolerances Are Off
The failure modes are practical and predictable.
| Failure | Cause | Guest Impact |
|---|---|---|
| Card will not insert | Pocket under-sized | Front desk forces it, damages the pocket |
| Card falls out | Pocket over-sized | Key is lost, replacement issued |
| Corner catch | No thumb exposure | Card edges wear and delaminate |
| Pocket splits | Paper too light for the load | Holder destroyed on first use |
| Two cards stick | No separation between slots | Guest cannot separate the keys |
The two most common causes are a specification written from a nominal card size without clearance, and a stock chosen for cost rather than for the load the pocket has to carry.
Choosing a Holder by Card Type
| Your Card | Recommended Holder | Reason |
|---|---|---|
| Standard CR80 key card | Sleeve, pocket holder, or folder | All built to ID-1 clearance |
| Two CR80 key cards | Dual-slot holder | Keeps cards separated |
| CR80 plus printed insert | Bi-fold folder | Extra panel for the insert |
| CR80 issued as a gift | Promotional sleeve or envelope | Presentation over handling |
| ID-2 access badge | Oversized holder | ID-1 holders are too small |
For the holder formats in detail, see our guides on hotel room key card holders, key card sleeves, and custom hotel key card holders.
Common Mistakes
| Mistake | Consequence | Fix |
|---|---|---|
| Card dimensions written in reverse | Pocket cut to the wrong orientation | Anchor on long edge = 85 mm |
| Specifying a pocket equal to the card | Card inserts but cannot be removed | Allow 6–8 mm thumb exposure |
| No clearance allowance | Fails against larger cards in the batch | Specify a range, not a nominal |
| Assuming all access cards are CR80 | Holder too small for an ID-2 badge | Measure the actual card first |
| Light stock for a dual-card pocket | Pocket tears | Match stock to the load |
| Skipping a physical fit test | Discovered at check-in | Test a real card in a real sample |
The last point is the practical safeguard: a fit test with the actual card in an actual holder sample removes almost all of the risk that the tolerance figures alone leave open.
Conclusion
Hotel key card size is not a variable — it is the CR80 format, standardised as ISO/IEC 7810 ID-1 at 85.60 × 53.98 mm and about 0.76 mm thick, the same dimensions as a credit card. The holder is what varies, and it is specified as the card plus clearance: a pocket width of 88–92 mm and a height of 57–62 mm, with 6–8 mm of the card left exposed so a guest can pull it out.
Keep the long edge first when writing the dimensions, allow a range rather than a nominal, and test the real card in a real sample before committing to a production run. For the product side, see our guides on hotel room key card holders and key card holders for hotels.
Sizing holders for a property or card programme? Request a quote and we will match the pocket clearance to your card.