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Unit of length equal to 66 feet, used especially in the U.S. public land surveys. The original measuring instrument (Gunter's chain) was literally a chain consisting of 100 iron links, each 7.92 inches long. Steel-ribbon tapes began to supersede chains around 1900, but surveying tapes are often still called "chains" and measuring with a tape is often called "chaining". The chain is a convenient unit in cadastral surveys because 10 square chains equal 1 acre.
A unit of distance equal to 3.0 statute miles (4.8 kilometers). Note that there also Nautical Leagues, UK Leagues and UK Nautical Leagues which all differ.
| Chains | US Leagues |
|---|---|
| 0ch | 0.00US lea |
| 1ch | 0.00US lea |
| 2ch | 0.01US lea |
| 3ch | 0.01US lea |
| 4ch | 0.02US lea |
| 5ch | 0.02US lea |
| 6ch | 0.03US lea |
| 7ch | 0.03US lea |
| 8ch | 0.03US lea |
| 9ch | 0.04US lea |
| 10ch | 0.04US lea |
| 11ch | 0.05US lea |
| 12ch | 0.05US lea |
| 13ch | 0.05US lea |
| 14ch | 0.06US lea |
| 15ch | 0.06US lea |
| 16ch | 0.07US lea |
| 17ch | 0.07US lea |
| 18ch | 0.08US lea |
| 19ch | 0.08US lea |
| Chains | US Leagues |
|---|---|
| 20ch | 0.08US lea |
| 21ch | 0.09US lea |
| 22ch | 0.09US lea |
| 23ch | 0.10US lea |
| 24ch | 0.10US lea |
| 25ch | 0.10US lea |
| 26ch | 0.11US lea |
| 27ch | 0.11US lea |
| 28ch | 0.12US lea |
| 29ch | 0.12US lea |
| 30ch | 0.13US lea |
| 31ch | 0.13US lea |
| 32ch | 0.13US lea |
| 33ch | 0.14US lea |
| 34ch | 0.14US lea |
| 35ch | 0.15US lea |
| 36ch | 0.15US lea |
| 37ch | 0.15US lea |
| 38ch | 0.16US lea |
| 39ch | 0.16US lea |
| Chains | US Leagues |
|---|---|
| 40ch | 0.17US lea |
| 41ch | 0.17US lea |
| 42ch | 0.18US lea |
| 43ch | 0.18US lea |
| 44ch | 0.18US lea |
| 45ch | 0.19US lea |
| 46ch | 0.19US lea |
| 47ch | 0.20US lea |
| 48ch | 0.20US lea |
| 49ch | 0.20US lea |
| 50ch | 0.21US lea |
| 51ch | 0.21US lea |
| 52ch | 0.22US lea |
| 53ch | 0.22US lea |
| 54ch | 0.23US lea |
| 55ch | 0.23US lea |
| 56ch | 0.23US lea |
| 57ch | 0.24US lea |
| 58ch | 0.24US lea |
| 59ch | 0.25US lea |