Convert Tsubo to Circular Mils
Convert Tsubo (坪) to Circular Mils (cmil) instantly and accurately.
Conversion Formula
cmil = 坪 × 6524050385
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.
About Circular Mils
A circular mil (cmil) is a unit used in electrical engineering to specify the cross-sectional area of round wires and cables. Equal to the area of a circle with a diameter of exactly one thou (one thousandth of an inch) - approximately 5.067 × 10⁻¹⁰ m² - it simplifies wire calculations: the cross-sectional area in cmil equals the wire diameter in mils, squared. US electrical codes (NEC/NEMA) specify conductor sizes in circular mils, and large cables are rated in thousands of circular mils (kcmil or MCM). A 12 AWG wire, common in US household wiring, has a cross-section of 6,530 cmil.
Quick Reference Table
| Tsubo (坪) | Circular Mils (cmil) |
|---|---|
| 1 坪 | 6.524 × 109 cmil |
| 2 坪 | 1.305 × 1010 cmil |
| 5 坪 | 3.262 × 1010 cmil |
| 10 坪 | 6.524 × 1010 cmil |
| 25 坪 | 1.631 × 1011 cmil |
| 50 坪 | 3.262 × 1011 cmil |
| 100 坪 | 6.524 × 1011 cmil |