Tsubo / m² / Tatami Converter
Convert between tsubo, square metres and tatami mats. Choose Kyōma, Chūkyō or Edoma tatami size. Handy for Japanese real-estate listings. Everything stays in your browser.
How to Use the Tsubo / Tatami Converter
Enter a value in any one field — tsubo, square metres or tatami mats — and the other fields update automatically. Pick the tatami standard that matches the property when the listing specifies Kyōma, Chūkyō or Edoma.
This helps when reading Japanese real-estate listings, floor plans, rental ads and land prices that mix Western square metres with traditional Japanese area units.
What are tsubo and tatami?
Tsubo (坪) and tatami mats are the traditional units for floor area in Japan. One tsubo is the size of two tatami mats — about 3.31 m². Even though m² is the legal standard, real-estate listings, floor plans and land prices in Japan are still quoted in tsubo, and room sizes are given as a number of tatami (a "6-jō room"). A tatami mat is not a fixed size, either: it differs by region (Kyōma in western Japan, Edoma around Tokyo). That mix is why a converter helps when you read a Japanese listing and want the area in plain m².
Quick reference
- 1 tsubo ≈ 3.305785 m² ≈ ~2.15 Edoma tatami
- 25 tsubo ≈ 82.64 m² — a typical mid-size apartment
- 6 tatami (Edoma) ≈ 9.24 m² ≈ 2.80 tsubo
When Reading Japanese Listings
Land is often described in tsubo, while room sizes are often described by tatami count. For foreigners buying, renting or comparing properties in Japan, converting both into square metres makes the actual floor area easier to compare across listings.