Credit card sizing is boring right up until it breaks a print run, clips a logo, or makes a barcode unscannable.
So here’s the clean truth: a “standard” credit card is not a vibe. It’s a specification. And if you design around guesses instead of numbers, you’ll pay for it (sometimes literally).
The standard size (ID‑1): inches, mm, thickness
If you want the globally recognized baseline, you’re designing around ISO/IEC 7810, ID‑1.
– Width: 3.375 in (3 3/8″) = 85.60 mm
– Height: 2.125 in (2 1/8″) = 53.98 mm (often rounded to 54.0 mm in print docs)
– Thickness: 0.76 mm (typical for CR80 PVC cards)
And yes, people call these “CR80” cards in the printing world. Same physical footprint, different jargon.
One-line reality check:
A credit card is 85.6 × 54 mm, not “about business-card sized.”
A quick source anchor
The ID‑1 dimensions above come straight from the ISO/IEC card size family used worldwide (ISO/IEC 7810). See: ISO/IEC 7810 (Identification cards, Physical characteristics). For more details on what are credit card dimensions, visit Metal Kards.
Pixels: the part that tricks people
Pixels don’t have a real-world size until you tie them to a DPI/PPI number. That’s the whole game.
The formula is simple:
pixels = inches × DPI
So for a standard card (3.375″ × 2.125″) here are common working sizes:
| DPI (PPI) | Width (px) | Height (px) |
|—:|—:|—:|
| 150 | ~506 px | ~319 px |
| 300 | ~1013 px | ~638 px |
| 600 | ~2025 px | ~1275 px |
You’ll sometimes see 1012×638 and sometimes 1013×638 at 300 DPI. That’s just rounding. I usually round to the nearest whole pixel and move on, because the printer driver is going to make its own rounding decisions anyway.
“Look, which DPI should I pick?”
Now, this won’t apply to everyone, but for most card artwork:
– 300 DPI is the practical baseline for print graphics
– 600 DPI is where fine microtext, tight linework, and sharp edges start behaving better (especially on mixed raster designs)
Here’s the thing: if your design is mostly vector (logos, text, shapes), DPI is less terrifying because vectors scale cleanly. The moment you place a raster background, photo, texture, or a QR code as an image… DPI stops being theoretical.
In my experience, the fastest way to get “mushy” text is to build at a low pixel size and upscale later. Don’t.
Pixel ⇄ millimeter conversion (for print sanity)
Two ways to convert, depending on what you’re holding in your hand:
If you know DPI
1 inch = 25.4 mm
So:
mm = (px ÷ DPI) × 25.4
px = (mm ÷ 25.4) × DPI
Example (300 DPI):
1 mm ≈ 11.811 px (because 300 ÷ 25.4)
That’s a useful mental shortcut if you’re laying out fine spacing.
If you don’t know DPI
Then you don’t know the physical size. Period.
A 1013×638 image could be a credit card, a billboard thumbnail, or an icon. DPI is the bridge.
Common design mistakes (and the fixes that actually hold up)
I’m going to be a little opinionated here: most “card design problems” are just spacing problems wearing different costumes.
Mistakes I see constantly:
– Text or logos pushed into rounded corners (it looks amateurish fast)
– No bleed, or fake bleed (a background that stops exactly at the cut line, yikes)
– Hairline strokes under ~0.25 pt that print inconsistently
– QR codes scaled down until they scan only on your phone in perfect light
Fixes that work:
– Build with three zones in mind: bleed, trim, safe
– Keep critical elements comfortably inside the safe zone
– If you’re using barcodes/QR, print-test them early (don’t trust on-screen scanning alone)
A short aside: I’ve watched “perfect” PDFs fail because someone exported at 72 PPI, then wondered why a photo looked like wet cardboard. That mistake is older than modern printers.
Corner radius and why your layout gets clipped
ISO ID‑1 cards have rounded corners. That means your “perfect rectangle” design is going to lose detail near edges unless you plan for it.
You don’t need to memorize the radius to design safely, but you do need to respect it:
– Don’t put fine text near the corners
– Don’t align logos to the extreme edges unless you like living dangerously
– If a vendor provides a template, use it (even if you think yours is better)
Printing vs. screens vs. card readers (the reality check section)
Bold opinion: designing a card only on a monitor is how you end up with a card that looks good nowhere.
Screens vary. Printers drift. Card stock reflects light differently than your nice matte display. And readers have their own tolerances.
If you’re validating across devices and readers, do this:
– Print a test at 100% scale (no “fit to page” nonsense)
– Measure it with a ruler or calipers
– Check scanning under bad lighting, not studio lighting
– Confirm any mag-stripe/signature/hologram zones if your production requires them
One sentence that saves projects:
If your printer dialog says “scale: 97%,” you’re already in trouble.
Quick reference: standard card size at 300 DPI
If you just want the numbers you’ll paste into Photoshop or your layout tool:
– 3.375″ × 2.125″
– 85.6 mm × 54.0 mm
– ~1013 px × 638 px at 300 DPI
– Thickness: 0.76 mm
That’s the baseline. Everything else is workflow, tolerance, and how picky your vendor is (some are very picky, for good reason).
A final practical tip (because this is where people slip)
If you’re sending files to a printer, ask what they want before you finish the design:
– preferred file format (PDF/X, AI, PSD, etc.)
– bleed requirements
– color profile (CMYK profile target)
– any lamination or finish that might darken colors
You’ll still design around ISO dimensions, but you won’t get surprised by production math at the worst possible moment.
