Tsubo to Square Meters Conversion Chart
| Tsubo (tsubo (坪)) | Square Meters (m²) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.5 tsubo (坪) | 1.65 m² | One standard tatami mat (1 jō), entryway genkan, or modular bathroom | 0.5 × 3.305785 = 1.65 m² |
| 1 tsubo (坪) | 3.31 m² | Two tatami mats, walk-in closet, or standard Japanese washroom | 1 × 3.305785 = 3.31 m² |
| 2 tsubo (坪) | 6.61 m² | Four tatami mats, traditional tea ceremony room, or compact studio kitchenette | 2 × 3.305785 = 6.61 m² |
| 3 tsubo (坪) | 9.92 m² | Six tatami mats (6-jō), the classic Tokyo 1R micro-studio living room | 3 × 3.305785 = 9.92 m² |
| 4 tsubo (坪) | 13.22 m² | Eight tatami mats (8-jō), standard primary master bedroom in Tokyo apartments | 4 × 3.305785 = 13.22 m² |
| 5 tsubo (坪) | 16.53 m² | Ten tatami mats (10-jō), large living area or studio unit floor plan | 5 × 3.305785 = 16.53 m² |
| 6 tsubo (坪) | 19.83 m² | Compact 1K Tokyo apartment total rentable floor space (approx 20 m²) | 6 × 3.305785 = 19.83 m² |
| 8 tsubo (坪) | 26.45 m² | Standard Tokyo 1DK apartment layout or spacious 1LDK living-dining suite | 8 × 3.305785 = 26.45 m² |
| 10 tsubo (坪) | 33.06 m² | Modern 1LDK urban condominium unit or compact starter apartment | 10 × 3.305785 = 33.06 m² |
| 15 tsubo (坪) | 49.59 m² | Two-bedroom (2LDK) Tokyo suburban residence or compact family flat | 15 × 3.305785 = 49.59 m² |
| 20 tsubo (坪) | 66.12 m² | Three-bedroom (3LDK) family condominium or narrow urban land lot footprint | 20 × 3.305785 = 66.12 m² |
| 25 tsubo (坪) | 82.64 m² | Four-bedroom (4LDK) suburban apartment or standard 2-story house building area | 25 × 3.305785 = 82.64 m² |
| 30 tsubo (坪) | 99.17 m² | Standard Japanese 100 m² single-family detached house (kodate) land plot | 30 × 3.305785 = 99.17 m² |
| 40 tsubo (坪) | 132.23 m² | Spacious multi-generation detached home plot in Kanagawa or Saitama | 40 × 3.305785 = 132.23 m² |
| 50 tsubo (坪) | 165.29 m² | Suburban residential building plot with private driveway and yard | 50 × 3.305785 = 165.29 m² |
| 100 tsubo (坪) | 330.58 m² | Commercial property parcel, retail store footprint, or small apartment complex lot | 100 × 3.305785 = 330.58 m² |
Tsubo to Square Meters Formula & Unit Definitions
The conversion ratio between Tsubo and Square Meter is legally defined as exactly 400/121 m² per tsubo (approximately 3.305785 m²). Multiplying any area in tsubo by 3.305785 yields its exact equivalent in square meters, while multiplying square meters by 0.3025 returns the original tsubo value.
Mental Estimation: Multiply your tsubo value by 3.3 to get square meters instantly in your head (e.g., 10 tsubo ≈ 33 m²). Conversely, divide square meters by 3.3 or multiply by 0.3 to estimate tsubo (e.g., 60 m² × 0.3 ≈ 18 tsubo).
Tsubo (坪)
Source Standard- Traditional Japanese Area Standard (1 Ken × 1 Ken)
- A fundamental unit of the Meiji-era Shakukan-hō system, defined as a square of 1 ken (6 shaku, or 20/11 m) on each side (1 tsubo = 400/121 m² ≈ 3.305785 m²).
- Universally equates to exactly two standard tatami mats (2 jō), forming the modular grid for Japanese timber-frame homes and Tokyo condominium layouts.
Square Meter (m²)
Target Standard- SI Metric Base Unit of Surface Area
- The internationally standardized coherent unit of area equal to a square measuring exactly 1 meter on each side.
- Mandated by Japan's 1966 Measurement Act for all official legal contracts, government registries, architectural blueprints, and land deeds.
Frequently Asked Questions
How do you convert tsubo to square meters accurately?
Multiply your area in tsubo by 3.305785 (or multiply by the exact legal fraction 400/121). For example, 10 tsubo × 3.305785 = 33.06 m². To convert back, use the reciprocal Square Meters to Tsubo converter.
What is the exact mathematical ratio between Tsubo and Square Meters?
One Tsubo equals exactly 400/121 square meters (approximately 3.305785 m²), while one square meter equals exactly 121/400 tsubo (0.3025 tsubo), established under the Japanese Weights and Measures Act.
How many tatami mats are in one tsubo?
One tsubo equals exactly two standard tatami mats (2 jō / 畳). For example, a 6-mat studio living room equals 3 tsubo (approx 9.92 m²).
What is a quick mental shortcut to convert tsubo to m² without a calculator?
Multiply the tsubo value by 3.3. For example, a 20-tsubo house is roughly 20 × 3.3 = 66 m² (the exact value is 66.12 m²), with an estimation error of less than 0.2%.
Why do Japanese real estate listings still quote prices in tsubo?
Although the metric system was made mandatory in 1966 for official contracts, tsubo remains deeply ingrained in Japanese real estate culture. Developers and brokers universally benchmark property land costs using tsubo-tanka (坪単価, price per tsubo).
Is this Tsubo to Square Meters converter free and secure?
Yes. All computations execute 100% locally on your device via client-side JavaScript. No property data, lot sizes, or personal information are transmitted to our servers.