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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 length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride
| Chains | Yards |
|---|---|
| 0ch | 0.00yd |
| 1ch | 22.00yd |
| 2ch | 44.00yd |
| 3ch | 66.00yd |
| 4ch | 88.00yd |
| 5ch | 110.00yd |
| 6ch | 132.00yd |
| 7ch | 154.00yd |
| 8ch | 176.00yd |
| 9ch | 198.00yd |
| 10ch | 220.00yd |
| 11ch | 242.00yd |
| 12ch | 264.00yd |
| 13ch | 286.00yd |
| 14ch | 308.00yd |
| 15ch | 330.00yd |
| 16ch | 352.00yd |
| 17ch | 374.00yd |
| 18ch | 396.00yd |
| 19ch | 418.00yd |
| Chains | Yards |
|---|---|
| 20ch | 440.00yd |
| 21ch | 462.00yd |
| 22ch | 484.00yd |
| 23ch | 506.00yd |
| 24ch | 528.00yd |
| 25ch | 550.00yd |
| 26ch | 572.00yd |
| 27ch | 594.00yd |
| 28ch | 616.00yd |
| 29ch | 638.00yd |
| 30ch | 660.00yd |
| 31ch | 682.00yd |
| 32ch | 704.00yd |
| 33ch | 726.00yd |
| 34ch | 748.00yd |
| 35ch | 770.00yd |
| 36ch | 792.00yd |
| 37ch | 814.00yd |
| 38ch | 836.00yd |
| 39ch | 858.00yd |
| Chains | Yards |
|---|---|
| 40ch | 880.00yd |
| 41ch | 902.00yd |
| 42ch | 924.00yd |
| 43ch | 946.00yd |
| 44ch | 968.00yd |
| 45ch | 990.00yd |
| 46ch | 1012.00yd |
| 47ch | 1034.00yd |
| 48ch | 1056.00yd |
| 49ch | 1078.00yd |
| 50ch | 1100.00yd |
| 51ch | 1122.00yd |
| 52ch | 1144.00yd |
| 53ch | 1166.00yd |
| 54ch | 1188.00yd |
| 55ch | 1210.00yd |
| 56ch | 1232.00yd |
| 57ch | 1254.00yd |
| 58ch | 1276.00yd |
| 59ch | 1298.00yd |
