Japanese Property Size Decoder

Japanese listings use 畳 (jō), 坪 (tsubo) and ㎡. Type what the listing says — get it in the units you actually understand, plus a feel for how big it really is.

From a Japanese listing

Tatami size varies by region — the same “6畳” can differ by 15%+. Listings legally must also show ㎡.

6 畳 · Ad standard · 1.62㎡ (1.62㎡/畳)

9.72 m²

105

sq ft

2.94

坪 (tsubo)

6.00

≈ 畳 jō

🏠 About one single bedroom — a typical Japanese washitsu / small room.

⚠️ Before you trust a number

㎡ is the legal size. 畳/坪 are traditional — always cross-check the ㎡ figure.
専有面積 vs 壁芯: Japan often measures from wall-center (壁芯), so usable space is a bit smaller than listed.
坪 equals the Korean 평 — the same unit (≈3.3058㎡).

Layout (間取り) — typical size

Madori	㎡	sq ft	坪
1R / 1K	13–25	140–270	4–8
1DK	25–30	270–323	8–9
1LDK	30–50	323–538	9–15
2LDK	50–70	538–753	15–21
3LDK	70–90	753–969	21–27

Quick reference 1坪 = 3.3058㎡ = 2畳 · 1畳 ≈ 1.62㎡

畳 (jō)	㎡	sq ft	坪
4.5畳	7.29	78	2.2
6畳	9.72	105	2.9
8畳	12.96	140	3.9
10畳	16.20	174	4.9

坪 (tsubo)	㎡	sq ft	畳
10坪	33.1	356	20
20坪	66.1	712	41
30坪	99.2	1068	61
50坪	165.3	1779	102

Popular conversions

6畳 8畳 10畳 30㎡40㎡50㎡20坪 30坪 1R/1K 1DK 1LDK 2LDK