span | 1 span | 2 span | 3 span | 4 span | 5 span | 6 span | 7 span | 8 span | 9 span | 10 span | 11 span | 12 span | 13 span | 14 span | 15 span | 16 span | 17 span | 18 span | 19 span | 20 span | 21 span | 22 span | 23 span | 24 span | 25 span | 26 span | 27 span | 28 span | 29 span | 30 span | 31 span | 32 span | 33 span | 34 span | 35 span | 36 span | 37 span | 38 span | 39 span | 40 span | 41 span | 42 span | 43 span | 44 span | 45 span | 46 span | 47 span | 48 span | 49 span | 50 span | 51 span | 52 span | 53 span | 54 span | 55 span | 56 span | 57 span | 58 span | 59 span | 60 span | 61 span | 62 span | 63 span | 64 span | 65 span | 66 span | 67 span | 68 span | 69 span | 70 span | 71 span | 72 span | 73 span | 74 span | 75 span | 76 span | 77 span | 78 span | 79 span | 80 span | 81 span | 82 span | 83 span | 84 span | 85 span | 86 span | 87 span | 88 span | 89 span | 90 span | 91 span | 92 span | 93 span | 94 span | 95 span | 96 span | 97 span | 98 span | 99 span | 100 span |
chain | 0.0113636 ch | 0.0227272 ch | 0.0340908 ch | 0.0454545 ch | 0.0568181 ch | 0.0681817 ch | 0.0795453 ch | 0.0909089 ch | 0.1022725 ch | 0.1136361 ch | 0.1249998 ch | 0.1363634 ch | 0.1477270 ch | 0.1590906 ch | 0.1704542 ch | 0.1818178 ch | 0.1931814 ch | 0.2045450 ch | 0.2159087 ch | 0.2272723 ch | 0.2386359 ch | 0.2499995 ch | 0.2613631 ch | 0.2727267 ch | 0.2840903 ch | 0.2954540 ch | 0.3068176 ch | 0.3181812 ch | 0.3295448 ch | 0.3409084 ch | 0.3522720 ch | 0.3636356 ch | 0.3749993 ch | 0.3863629 ch | 0.3977265 ch | 0.4090901 ch | 0.4204537 ch | 0.4318173 ch | 0.4431809 ch | 0.4545446 ch | 0.4659082 ch | 0.4772718 ch | 0.4886354 ch | 0.4999990 ch | 0.5113626 ch | 0.5227262 ch | 0.5340898 ch | 0.5454535 ch | 0.5568171 ch | 0.5681807 ch | 0.5795443 ch | 0.5909079 ch | 0.6022715 ch | 0.6136351 ch | 0.6249988 ch | 0.6363624 ch | 0.6477260 ch | 0.6590896 ch | 0.6704532 ch | 0.6818168 ch | 0.6931804 ch | 0.7045441 ch | 0.7159077 ch | 0.7272713 ch | 0.7386349 ch | 0.7499985 ch | 0.7613621 ch | 0.7727257 ch | 0.7840894 ch | 0.7954530 ch | 0.8068166 ch | 0.8181802 ch | 0.8295438 ch | 0.8409074 ch | 0.8522710 ch | 0.8636346 ch | 0.8749983 ch | 0.8863619 ch | 0.8977255 ch | 0.9090891 ch | 0.9204527 ch | 0.9318163 ch | 0.9431799 ch | 0.9545436 ch | 0.9659072 ch | 0.9772708 ch | 0.9886344 ch | 0.9999980 ch | 1.0113616 ch | 1.0227252 ch | 1.0340889 ch | 1.0454525 ch | 1.0568161 ch | 1.0681797 ch | 1.0795433 ch | 1.0909069 ch | 1.1022705 ch | 1.1136341 ch | 1.1249978 ch | 1.1363614 ch |
A span is the distance measured by a human hand, from the tip of the thumb to the tip of the little finger. In ancient times, a span was considered to be half a cubit. Sometimes the distinction is made between the great span (thumb to little finger) and little span (index finger to little finger).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
span | span | ≡ 9 in | = 0.2286 m | Imperial/US |
spans | chains | spans | chains |
---|---|---|---|
1 | ≈ 0.011363613768365 | 4 | ≈ 0.045454455073461 |
1.5 | ≈ 0.017045420652548 | 4.5 | ≈ 0.051136261957643 |
2 | ≈ 0.02272722753673 | 5 | ≈ 0.056818068841826 |
2.5 | ≈ 0.028409034420913 | 5.5 | ≈ 0.062499875726009 |
3 | ≈ 0.034090841305096 | 6 | ≈ 0.068181682610191 |
A chain is a unit of length. It measures 66 feet, or 22 yards, or 100 links, or 4 rods (20.1168 m). There are 10 chains in a furlong, and 80 chains in one statute mile. An acre is the area of 10 square chains (that is, an area of one chain by one furlong). The chain has been used for several centuries in Britain and in some other countries influenced by British practice.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
chain | ch | ≡ 66 ft (US) ≡ 4 rods | ≈ 20.11684 m | Imperial/US |
chains | spans | chains | spans |
---|---|---|---|
1 | ≈ 88.000174978128 | 4 | ≈ 352.00069991251 |
1.5 | ≈ 132.00026246719 | 4.5 | ≈ 396.00078740157 |
2 | ≈ 176.00034995626 | 5 | ≈ 440.00087489064 |
2.5 | ≈ 220.00043744532 | 5.5 | ≈ 484.0009623797 |
3 | ≈ 264.00052493438 | 6 | ≈ 528.00104986877 |
spans | chains |
---|---|
1 | ≈ 0.0113636 |
88.0001750 | ≈ 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |