Convert Square Millimeters to Tsubo
Convert Square Millimeters (mm²) to Tsubo (坪) instantly and accurately.
Conversion Formula
坪 = mm² × 3.025000000e-7
About Square Millimeters
A square millimeter (mm²) is a metric unit of area equal to a square with sides of one millimeter. It is commonly used in precision engineering, electronics, and measuring very small surfaces such as microchips or printed circuit boards. To visualise: a typical pinhead has an area of about 2-3 mm². This unit is essential in microscopy, medical imaging, and manufacturing where tiny, precise measurements are critical.
About Tsubo
A tsubo (坪) is the traditional Japanese unit of floor area, equal to 400/121 m² (approximately 3.306 m²) - defined as the footprint of two tatami mats placed side by side. It has been the standard for measuring rooms and apartments in Japan for centuries and remains widely used in real estate and architecture today. Apartment sizes in Japan are routinely quoted in tsubo alongside square meters. One tsubo equals approximately 35.58 square feet or 3.95 square yards.
Quick Reference Table
| Square Millimeters (mm²) | Tsubo (坪) |
|---|---|
| 1 mm² | 3.025 × 10-7 坪 |
| 2 mm² | 6.05 × 10-7 坪 |
| 5 mm² | 1.513 × 10-6 坪 |
| 10 mm² | 3.025 × 10-6 坪 |
| 25 mm² | 7.563 × 10-6 坪 |
| 50 mm² | 1.513 × 10-5 坪 |
| 100 mm² | 3.025 × 10-5 坪 |