A Japanese room’s size is given in jō (畳) — the number of tatami mats. Convert jō to square meters (and square feet).
1 jō = 1.62 m² (17.4375 sq ft) / 1 m² = 0.617284 jō
| jō | m² | sq ft |
|---|---|---|
| 1 | 1.62 | 17.4375 |
| 2 | 3.24 | 34.8751 |
| 3 | 4.86 | 52.3126 |
| 4.5 | 7.29 | 78.4689 |
| 6 | 9.72 | 104.625 |
| 8 | 12.96 | 139.5 |
| 10 | 16.2 | 174.375 |
| 12 | 19.44 | 209.25 |
| 20 | 32.4 | 348.751 |
| m² | jō |
|---|---|
| 1 | 0.617284 |
| 2 | 1.23457 |
| 3 | 1.85185 |
| 5 | 3.08642 |
| 10 | 6.17284 |
| 16.2 | 10 |
| 20 | 12.3457 |
| 30 | 18.5185 |
| 50 | 30.8642 |
Chart values are rounded to 6 significant figures.
One jō (畳) is the floor area of a single tatami mat. For real-estate listings this converter uses 1 jō = 1.62 m² (the minimum set by the Fair Competition Code), so one square meter is about 0.617284 jō.
At that rate a 6-jō room (a very common size) is about 9.72 m², and one jō is also about 17.4375 sq ft.
Real tatami mats vary by region, so “jō” is not one fixed area. Japan’s Fair Competition Code for real-estate advertising sets a minimum of 1.62 m² per jō, and this converter uses 1 jō = 1.62 m². Regional mats differ: Kyōma ≈ 1.82 m², Chūkyōma ≈ 1.66 m², Edoma ≈ 1.55 m², and Danchima (apartment) ≈ 1.45 m² (reference values).
Room sizes in Japan are almost always quoted in jō — “6 jō” (6 tatami) is the classic single room.
← All Japanese units converters
1 jō = 1.62 m² (about 17.4375 sq ft). Going the other way, 1 m² = 0.617284 jō. One jō (畳) is the floor area of a single tatami mat. For real-estate listings this converter uses 1 jō = 1.62 m² (the minimum set by the Fair Competition Code), so one square meter is about 0.617284 jō.
Type a number into either box of the converter above and the other value appears instantly; use the ⇄ button to swap which unit is on the left. All figures are rounded to 6 significant figures and calculated in your browser.
