Wallet size usually means about 3.5 x 4.5 inches for a classic folded wallet or around 4.5 x 3.5 inches depending on the style and orientation. Slim front-pocket wallets are often smaller, while travel wallets are larger.

Common wallet sizes

Type| Typical size
---|---
Classic bifold| about 4.5 x 3.5 inches 17
Trifold| about 4 x 3 inches folded 1
Slim front-pocket wallet| about 4 x 3 inches or smaller 27
Card holder| about 3.5 x 2.5 inches 1

Quick note

If you meant a wallet-size photo , that is commonly 2.5 x 3.5 inches in the U.S..