The Chain (Gunter's chain) was fundamental in surveying the American frontier. Measuring 66 feet (4 rods), it's the length of a cricket pitch. Ten square chains make an acre. Modern surveyors still reference chains in legal descriptions, and the unit remains visible in rural road layouts across the US. The Mile (mi) is commonly used in the United States and the UK for road distances (e.g., 10 mi to the next town), marathon running (26.2 mi), and aviation. It's also used in athletics (e.g., 4-minute mile) and car speed limits (mph).
To convert between Chain (ch) and Mile (mi), use the following formulas:
1 Chain (ch) = 0.0125 Mile (mi)
1 Mile (mi) = 80 Chain (ch)
1 ch = 1 * 0.0125 mi = 0.0125 mi
5 ch = 5 * 0.0125 mi = 0.0625 mi
10 ch = 10 * 0.0125 mi = 0.125 mi
20 ch = 20 * 0.0125 mi = 0.25 mi
50 ch = 50 * 0.0125 mi = 0.625 mi
100 ch = 100 * 0.0125 mi = 1.25 mi
| Chain (ch) | Mile (mi) |
|---|---|
| 1 ch | 0.0125 mi |
| 5 ch | 0.0625 mi |
| 10 ch | 0.125 mi |
| 20 ch | 0.25 mi |
| 50 ch | 0.625 mi |
| 100 ch | 1.25 mi |