Convert Circular Mils to Rai
Convert Circular Mils (cmil) to Rai (rai) instantly and accurately.
Conversion Formula
rai = cmil × 3.166921744e-13
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.
About Rai
A rai (ไร่) is the standard Thai unit of land area, defined as exactly 1,600 m² (40 m × 40 m). It is used throughout Thailand for all land measurement - from rice paddies to urban plots and national parks. Thai real estate listings always quote land area in rai, ngan (400 m² = ¼ rai), and talang wah (4 m² = 1 square wah). Thailand's total rice-paddy area is reported in millions of rai. One rai equals approximately 0.395 acres or 0.16 hectares.
Quick Reference Table
| Circular Mils (cmil) | Rai (rai) |
|---|---|
| 1 cmil | 3.167 × 10-13 rai |
| 2 cmil | 6.334 × 10-13 rai |
| 5 cmil | 1.583 × 10-12 rai |
| 10 cmil | 3.167 × 10-12 rai |
| 25 cmil | 7.917 × 10-12 rai |
| 50 cmil | 1.583 × 10-11 rai |
| 100 cmil | 3.167 × 10-11 rai |