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Conversion Formula:
Convert Square Millimeter to Tatami Mat (mm² to tatami) instantly with accurate, readable results.
Convert between square meters, acres, square feet, hectares, and other common units with our Area Unit Converter. This intuitive unit conversion tool helps you calculate land size, floor space, and surface area across both metric and imperial systems. Whether you're working on real estate, construction, or geography tasks, our area unit conversion calculator ensures precise and instant results.
Square millimeter (mm²) - tiny metric area
Square millimeter is a metric unit of area equal to the area of a square with sides of 1 millimeter. Used for tiny surface areas, cross-sections, and component footprints in engineering and electronics.
- Symbol: mm²
- System: SI derived unit
- Exact relations: 1 mm² = (0.001 m)² = 1×10⁻⁶ m² = 0.01 cm²; 100 mm² = 1 cm²
- Imperial/US equivalents: 1 mm² = 1/645.16 in² ≈ 0.0015500031 in² ≈ 0.00001076391 ft² ≈ 0.00000119599 yd²
- Typical examples: wire cross-sectional areas (e.g., 2.5 mm²), microchip die areas, small nozzle or orifice openings
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