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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 metric unit of length equal to one tenth of a meter
| Chains | Decimeters |
|---|---|
| 0ch | 0.00dm |
| 1ch | 201.17dm |
| 2ch | 402.34dm |
| 3ch | 603.51dm |
| 4ch | 804.67dm |
| 5ch | 1005.84dm |
| 6ch | 1207.01dm |
| 7ch | 1408.18dm |
| 8ch | 1609.35dm |
| 9ch | 1810.52dm |
| 10ch | 2011.68dm |
| 11ch | 2212.85dm |
| 12ch | 2414.02dm |
| 13ch | 2615.19dm |
| 14ch | 2816.36dm |
| 15ch | 3017.53dm |
| 16ch | 3218.69dm |
| 17ch | 3419.86dm |
| 18ch | 3621.03dm |
| 19ch | 3822.20dm |
| Chains | Decimeters |
|---|---|
| 20ch | 4023.37dm |
| 21ch | 4224.54dm |
| 22ch | 4425.70dm |
| 23ch | 4626.87dm |
| 24ch | 4828.04dm |
| 25ch | 5029.21dm |
| 26ch | 5230.38dm |
| 27ch | 5431.55dm |
| 28ch | 5632.72dm |
| 29ch | 5833.88dm |
| 30ch | 6035.05dm |
| 31ch | 6236.22dm |
| 32ch | 6437.39dm |
| 33ch | 6638.56dm |
| 34ch | 6839.73dm |
| 35ch | 7040.89dm |
| 36ch | 7242.06dm |
| 37ch | 7443.23dm |
| 38ch | 7644.40dm |
| 39ch | 7845.57dm |
| Chains | Decimeters |
|---|---|
| 40ch | 8046.74dm |
| 41ch | 8247.90dm |
| 42ch | 8449.07dm |
| 43ch | 8650.24dm |
| 44ch | 8851.41dm |
| 45ch | 9052.58dm |
| 46ch | 9253.75dm |
| 47ch | 9454.91dm |
| 48ch | 9656.08dm |
| 49ch | 9857.25dm |
| 50ch | 10058.42dm |
| 51ch | 10259.59dm |
| 52ch | 10460.76dm |
| 53ch | 10661.93dm |
| 54ch | 10863.09dm |
| 55ch | 11064.26dm |
| 56ch | 11265.43dm |
| 57ch | 11466.60dm |
| 58ch | 11667.77dm |
| 59ch | 11868.94dm |