One tsubo is exactly 400/121 m², about 3.3058 m². Japan’s 1891 Weights and Measures Act fixed the shaku at 10/33 m, and a tsubo is a square ken of 6 shaku, so the result is a precise fraction. Going the other way, multiply square meters by 0.3025 to get tsubo: 100 m² is 30.25 tsubo and 30 tsubo is about 99.17 m².
Formula
Tsubo to Square Meters conversion table
| Tsubo | Square Meters |
|---|---|
| 0.25 tsubo | 0.826446 m² |
| 0.5 tsubo | 1.6529 m² |
| 1 tsubo | 3.3058 m² |
| 2 tsubo | 6.6116 m² |
| 3 tsubo | 9.9174 m² |
| 4 tsubo | 13.2231 m² |
| 5 tsubo | 16.5289 m² |
| 6 tsubo | 19.8347 m² |
| 7 tsubo | 23.1405 m² |
| 8 tsubo | 26.4463 m² |
| 9 tsubo | 29.7521 m² |
| 10 tsubo | 33.0579 m² |
| 15 tsubo | 49.5868 m² |
| 20 tsubo | 66.1157 m² |
| 25 tsubo | 82.6446 m² |
| 30 tsubo | 99.1736 m² |
| 40 tsubo | 132.2314 m² |
| 50 tsubo | 165.2893 m² |
| 60 tsubo | 198.3471 m² |
| 70 tsubo | 231.405 m² |
| 75 tsubo | 247.9339 m² |
| 80 tsubo | 264.4628 m² |
| 90 tsubo | 297.5207 m² |
| 100 tsubo | 330.5785 m² |
| 250 tsubo | 826.4463 m² |
| 500 tsubo | 1,652.89 m² |
| 1,000 tsubo | 3,305.79 m² |
Where you’ll use it
Japanese land and floor area are recorded officially in square meters, but listings, land price discussions and conversations with builders still use tsubo, often as a price per tsubo. Converting lets you compare a land price per tsubo with a price per square meter, or match a floor plan in tsubo to building rules written in metric. The same factor applies to the Korean pyeong and the Taiwanese ping.
Tip: A tsubo is two tatami mats, so a 6-tatami room is 3 tsubo, about 9.92 m². Tatami sizes vary by region, so use the plan’s square meters for anything precise.