Baseball card sizes varied over the years, but if you’re asking how big are baseball cards, you’re probably thinking of the most common size. The most common size for baseball cards is 2 1/2 inches by 3 1/2 inches, the same size as a wallet-size photograph.
David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.
