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Convert Tatami Mat to Rood (tatami to ro) instantly with accurate, readable results.
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Tatami mat (畳, jō) - Japanese flooring unit of area
Tatami mat is a traditional Japanese flooring module used as a practical unit of area; room sizes are often stated by the count of mats (jō). Dimensions vary regionally, so one tatami has no single national standard.
- Names/aliases: tatami, 畳 (jō); room size written as “n-jō”
- System: Traditional Japanese (non-SI)
- Typical sizes (area):
• Kyōma (Kyoto): 0.955 m × 1.910 m = 1.824 m² ≈ 19.63 ft²
• Chūkyōma (Nagoya): 0.910 m × 1.820 m = 1.656 m² ≈ 17.83 ft²
• Edoma/Kantōma (Tokyo area): 0.880 m × 1.760 m = 1.5488 m² ≈ 16.67 ft²
• Other regional modules exist; common range ≈ 1.55–1.82 m² per mat
- Room estimates: 6-jō room ≈ 9–11 m² depending on region; 8-jō ≈ 12–15 m²
- Construction note: buildings often use tatami modules as planning grids; mats are rectangular with length ≈ 2 × width
Rood (rood) - traditional land area
Rood is a historical Imperial/US customary unit of area equal to one quarter of an acre. Used in older land records, field measurements, and some property descriptions.
- Symbol: none standardized (written as “rood”)
- System: Imperial/US customary (historic)
- Exact relations: 1 rood = 1/4 acre = 40 square rods (perches) = 2.5 square chains
- Other relations: 1 rood = 1 furlong × 1 rod = 10,890 ft² = 1,210 yd²
- Metric equivalents (exact): 1 rood = 1011.7141056 m²
- Typical examples: historical parcel sizes in deeds; subdivision remnants expressed as roods and perches