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 Kilometer (km) is used for longer distances like city-to-city travel (e.g., 50 km), marathon races (42.195 km), or highway spans (e.g., 100 km). It's also used in aviation and sports like cycling.
To convert between Chain (ch) and Kilometer (km), use the following formulas:
1 Chain (ch) = 0.0201168 Kilometer (km)
1 Kilometer (km) = 49.709695378986716 Chain (ch)
1 ch = 1 * 0.0201168 km = 0.0201168 km
5 ch = 5 * 0.0201168 km = 0.100584 km
10 ch = 10 * 0.0201168 km = 0.201168 km
20 ch = 20 * 0.0201168 km = 0.402336 km
50 ch = 50 * 0.0201168 km = 1.00584 km
100 ch = 100 * 0.0201168 km = 2.01168 km
| Chain (ch) | Kilometer (km) |
|---|---|
| 1 ch | 0.0201168 km |
| 5 ch | 0.100584 km |
| 10 ch | 0.201168 km |
| 20 ch | 0.402336 km |
| 50 ch | 1.00584 km |
| 100 ch | 2.01168 km |