Credit card dimensions
A credit card measures 85.60 × 53.98 mm and is 0.76 mm thick. That is the full ISO/IEC 7810 ID-1 specification — including the corner radius most charts leave out.
The complete specification
| Dimension | Metric | Imperial |
|---|---|---|
| Width | 85.60 mm | 3.370 in |
| Height | 53.98 mm | 2.125 in |
| Thickness | 0.76 mm | 0.030 in |
| Corner radius | 3.18 mm | 0.125 in |
| Diagonal | 101.6 mm | 4.00 in |
Why the odd numbers?
85.60 × 53.98 mm looks arbitrary until you convert it: it is almost exactly 3.370 × 2.125 inches. The standard was drafted when imperial units still dominated card manufacturing, then defined in millimetres for international use. The height, 53.98 mm, is exactly 2.125 inches — which is why it carries two decimal places while the width does not.
The tolerance
ISO/IEC 7810 allows a tolerance of roughly ±0.13 mm on width and height. In practice every card you own falls inside that window, which is why they all sit flush in the same wallet slot and pass through the same card readers.
Frequently asked questions
What are the exact dimensions of a credit card?
85.60 mm wide, 53.98 mm tall and 0.76 mm thick, with a corner radius of about 3.18 mm — the ISO/IEC 7810 ID-1 standard.
How thick is a credit card?
0.76 mm, which is 0.030 inches. This is fixed by the standard so cards work in every reader and ATM.
What is the diagonal of a credit card?
About 101.6 mm, or exactly 4 inches.
Do all credit cards have the same dimensions?
Yes. Every payment card issued worldwide is built to ISO/IEC 7810 ID-1, within a tolerance of roughly ±0.13 mm.