Convert Circular Mils to Square Furlongs
Convert Circular Mils (cmil) to Square Furlongs (fur²) instantly and accurately.
Conversion Formula
fur² = cmil × 1.252101449e-14
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 Square Furlongs
A square furlong is an area unit equal to a square with sides of one furlong (220 yards or ~201.17 m), approximately 40,469 m² or exactly 10 acres. The furlong (from Old English 'furrow-long') was historically the standard ploughing distance, and 10 square furlongs equals one acre - a relationship that made traditional land surveying convenient. While square furlongs are rarely used in official modern measurements, they appear in historical land surveys, British horse racing contexts, and as a handy reference for visualising 10-acre blocks.
Quick Reference Table
| Circular Mils (cmil) | Square Furlongs (fur²) |
|---|---|
| 1 cmil | 1.252 × 10-14 fur² |
| 2 cmil | 2.504 × 10-14 fur² |
| 5 cmil | 6.261 × 10-14 fur² |
| 10 cmil | 1.252 × 10-13 fur² |
| 25 cmil | 3.13 × 10-13 fur² |
| 50 cmil | 6.261 × 10-13 fur² |
| 100 cmil | 1.252 × 10-12 fur² |