US and European size cards from an A4 sheet
The card used across most of the English-speaking world is 3.5 by 2 inches, roughly 89 by 51 mm — a little smaller than the Japanese standard and a better fit for Western wallets.
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How it differs from the Japanese card
The Japanese card is 91 by 55 mm, an aspect ratio of 1.65; the US card is 89 by 51 mm at 1.75, so it reads as longer and thinner. The difference is only 2 mm wide and 4 mm tall, but Western card holders and wallet slots are cut for 3.5 inches, and a Japanese card sometimes will not go in. For a conference abroad, print the local size.
The hierarchy of information changes too
A Japanese card leads with the company, then the division, the title, and finally the name. Western practice reverses that: the name is largest, the role second, the company understated. Write the address down to the country and start phone numbers with the international code. A card with English on one side and Japanese on the other covers both conventions in one print run.
Why ten still fit on A4
Two cards across measure 178 mm inside A4 is 210, leaving 16 mm each side; five down measure 255 mm inside 297, leaving 21 mm top and bottom. That is more slack than the Japanese card allows, so the unprintable border of a home printer is never a concern and you can widen the margin and still keep ten up.
Frequently asked questions
Can I use Letter paper instead?
Yes. Choose Letter (215.9 by 279.4 mm) and the 89 by 51 mm card still lands two across and five down, ten up. If the sheet will be printed abroad, building it on Letter from the start saves a scaling problem later.
Is 89 by 51 mm the same as 3.5 by 2 inches?
Almost. Exactly 3.5 inches is 88.9 mm and 2 inches is 50.8 mm, so 89 by 51 is a rounded-up value about a tenth of a millimetre larger — well inside normal cutting tolerance. Enter 88.9 by 50.8 as a custom size if you want it exact.
Any advice for an English front and Japanese back?
Turn on double-sided, load the English design as the front and the Japanese one as the back. The back sheet is mirrored so each card gets its own reverse, and long-edge binding on a duplex printer handles the rest.