Tsubo & Unit Conversion
What a tsubo (坪) really is, and how to convert between tsubo, square metres, and square feet — with a live calculator.
Tsubo
— Japan's traditional area unit
A tsubo (坪) is the traditional Japanese unit of area used throughout the real estate industry, equal to approximately 3.3058 square metres — roughly the floor space of two standard tatami mats.
Even though Japanese law uses the metric system, listing sheets, price quotes, and land registries still show tsubo alongside square metres. A "¥1.2M per tsubo" land price is common shorthand in developer marketing, and the floor area of a detached house is usually reported in both tsubo and ㎡.
For foreign buyers, the quickest way to think in tsubo: 1 tsubo ≈ 3.3 ㎡ ≈ 35.6 sqft. A 20-tsubo apartment is roughly 66 ㎡ (710 sqft) — a typical two-bedroom Tokyo unit.
Convert tsubo ↔ m² ↔ sqft
Type any number in any field — the other two update instantly.
Area Unit Converter
Tsubo (坪) · Square metre (㎡) · Square foot (sqft)
Exact ratios used: 1 tsubo = 400 / 121 ㎡ ≈ 3.3058 ㎡ · 1 ㎡ = 10.7639 sqft.
Results are rounded to two decimal places. For legal filings always defer to the registered ㎡ figure.
| Tsubo (坪) | Square metre (㎡) | Square foot (sqft) | Typical use |
|---|---|---|---|
| 1 | 3.31 | 35.58 | 2 tatami mats |
| 10 | 33.06 | 355.83 | Studio / 1R apartment |
| 15 | 49.59 | 533.74 | Compact 1LDK |
| 20 | 66.12 | 711.65 | Standard 2LDK |
| 30 | 99.17 | 1,067.48 | Family 3LDK / small detached house |
| 50 | 165.29 | 1,779.14 | Large detached home footprint |
| 100 | 330.58 | 3,558.27 | Mid-size plot of land |
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