Convert Square Furlongs to Circular Mils
Convert Square Furlongs (fur²) to Circular Mils (cmil) instantly and accurately.
Conversion Formula
cmil = fur² × 79865732980000
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.
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
| Square Furlongs (fur²) | Circular Mils (cmil) |
|---|---|
| 1 fur² | 7.987 × 1013 cmil |
| 2 fur² | 1.597 × 1014 cmil |
| 5 fur² | 3.993 × 1014 cmil |
| 10 fur² | 7.987 × 1014 cmil |
| 25 fur² | 1.997 × 1015 cmil |
| 50 fur² | 3.993 × 1015 cmil |
| 100 fur² | 7.987 × 1015 cmil |