Convert Circular Mils to Roods
Convert Circular Mils (cmil) to Roods (ro) instantly and accurately.
Conversion Formula
ro = cmil × 5.008405797e-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 Roods
A rood (ro) is a traditional English unit of land area equal to one quarter of an acre, or 40 square rods, approximately 1,011.71 m². Originating in medieval England, the rood was used alongside the acre and the perch for describing land ownership. The name shares its root with 'rod,' the linear unit used to measure it. While largely obsolete in modern use, roods still appear in old English legal documents, historical land surveys, and certain rural property records in England and Wales.
Quick Reference Table
| Circular Mils (cmil) | Roods (ro) |
|---|---|
| 1 cmil | 5.008 × 10-13 ro |
| 2 cmil | 1.002 × 10-12 ro |
| 5 cmil | 2.504 × 10-12 ro |
| 10 cmil | 5.008 × 10-12 ro |
| 25 cmil | 1.252 × 10-11 ro |
| 50 cmil | 2.504 × 10-11 ro |
| 100 cmil | 5.008 × 10-11 ro |