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Conversion Formula:
Convert Square Rod to Tatami Mat (rod² to tatami) instantly with accurate, readable results.
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Square rod (sq rd; also perch, pole, lug) - traditional land area
Square rod is a historical Imperial/US customary unit of area equal to a square one rod on a side. Used in older land records and surveying alongside roods and acres.
- Symbols: sq rd, rd²; also “square perch”
- System: Imperial/US customary (historic)
- Exact relations: 1 sq rd = (16.5 ft)² = 272.25 ft² = (5.5 yd)² = 30.25 yd² = (5.0292 m)² = 25.29285264 m² (exact)
- Other relations: 40 sq rd = 1 rood; 160 sq rd = 1 acre; 16 sq rd = 1 square chain
- Typical examples: deed descriptions such as “2 roods 13 perches”; 19th-century cadastral plans
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