4.5畳 = 7.29 m² (78.5 sq ft · 2.21 坪)
From a Japanese listing
Tatami size varies by region — the same “6畳” can differ by 15%+. Listings legally must also show ㎡.
4.5畳
🏠 About one single bedroom — a typical Japanese washitsu / small room.
㎡ is the legal size. 畳/坪 are traditional — always cross-check the ㎡ figure.