| metric inch | 1 in (metric) | 2 in (metric) | 3 in (metric) | 4 in (metric) | 5 in (metric) | 6 in (metric) | 7 in (metric) | 8 in (metric) | 9 in (metric) | 10 in (metric) | 11 in (metric) | 12 in (metric) | 13 in (metric) | 14 in (metric) | 15 in (metric) | 16 in (metric) | 17 in (metric) | 18 in (metric) | 19 in (metric) | 20 in (metric) | 21 in (metric) | 22 in (metric) | 23 in (metric) | 24 in (metric) | 25 in (metric) | 26 in (metric) | 27 in (metric) | 28 in (metric) | 29 in (metric) | 30 in (metric) | 31 in (metric) | 32 in (metric) | 33 in (metric) | 34 in (metric) | 35 in (metric) | 36 in (metric) | 37 in (metric) | 38 in (metric) | 39 in (metric) | 40 in (metric) | 41 in (metric) | 42 in (metric) | 43 in (metric) | 44 in (metric) | 45 in (metric) | 46 in (metric) | 47 in (metric) | 48 in (metric) | 49 in (metric) | 50 in (metric) | 51 in (metric) | 52 in (metric) | 53 in (metric) | 54 in (metric) | 55 in (metric) | 56 in (metric) | 57 in (metric) | 58 in (metric) | 59 in (metric) | 60 in (metric) | 61 in (metric) | 62 in (metric) | 63 in (metric) | 64 in (metric) | 65 in (metric) | 66 in (metric) | 67 in (metric) | 68 in (metric) | 69 in (metric) | 70 in (metric) | 71 in (metric) | 72 in (metric) | 73 in (metric) | 74 in (metric) | 75 in (metric) | 76 in (metric) | 77 in (metric) | 78 in (metric) | 79 in (metric) | 80 in (metric) | 81 in (metric) | 82 in (metric) | 83 in (metric) | 84 in (metric) | 85 in (metric) | 86 in (metric) | 87 in (metric) | 88 in (metric) | 89 in (metric) | 90 in (metric) | 91 in (metric) | 92 in (metric) | 93 in (metric) | 94 in (metric) | 95 in (metric) | 96 in (metric) | 97 in (metric) | 98 in (metric) | 99 in (metric) | 100 in (metric) |
| chain | 1.9883838614812 × 10-5 ch | 3.9767677229625 × 10-5 ch | 5.9651515844437 × 10-5 ch | 7.9535354459249 × 10-5 ch | 9.9419193074061 × 10-5 ch | 0.0001193 ch | 0.0001392 ch | 0.0001591 ch | 0.0001790 ch | 0.0001988 ch | 0.0002187 ch | 0.0002386 ch | 0.0002585 ch | 0.0002784 ch | 0.0002983 ch | 0.0003181 ch | 0.0003380 ch | 0.0003579 ch | 0.0003778 ch | 0.0003977 ch | 0.0004176 ch | 0.0004374 ch | 0.0004573 ch | 0.0004772 ch | 0.0004971 ch | 0.0005170 ch | 0.0005369 ch | 0.0005567 ch | 0.0005766 ch | 0.0005965 ch | 0.0006164 ch | 0.0006363 ch | 0.0006562 ch | 0.0006761 ch | 0.0006959 ch | 0.0007158 ch | 0.0007357 ch | 0.0007556 ch | 0.0007755 ch | 0.0007954 ch | 0.0008152 ch | 0.0008351 ch | 0.0008550 ch | 0.0008749 ch | 0.0008948 ch | 0.0009147 ch | 0.0009345 ch | 0.0009544 ch | 0.0009743 ch | 0.0009942 ch | 0.0010141 ch | 0.0010340 ch | 0.0010538 ch | 0.0010737 ch | 0.0010936 ch | 0.0011135 ch | 0.0011334 ch | 0.0011533 ch | 0.0011731 ch | 0.0011930 ch | 0.0012129 ch | 0.0012328 ch | 0.0012527 ch | 0.0012726 ch | 0.0012924 ch | 0.0013123 ch | 0.0013322 ch | 0.0013521 ch | 0.0013720 ch | 0.0013919 ch | 0.0014118 ch | 0.0014316 ch | 0.0014515 ch | 0.0014714 ch | 0.0014913 ch | 0.0015112 ch | 0.0015311 ch | 0.0015509 ch | 0.0015708 ch | 0.0015907 ch | 0.0016106 ch | 0.0016305 ch | 0.0016504 ch | 0.0016702 ch | 0.0016901 ch | 0.0017100 ch | 0.0017299 ch | 0.0017498 ch | 0.0017697 ch | 0.0017895 ch | 0.0018094 ch | 0.0018293 ch | 0.0018492 ch | 0.0018691 ch | 0.0018890 ch | 0.0019088 ch | 0.0019287 ch | 0.0019486 ch | 0.0019685 ch | 0.0019884 ch |
A metric inch is a nickname for a preferred 1⁄4 subdivision of an ISO 2848 basic module, or 1⁄12 of a metric foot measuring 25 millimetres (0.984 in). A metric inch is 0.4 millimetres (0.016 in) shorter than an inch.
The term was similarly used to refer to the historical Soviet Bloc practice of spacing integrated circuit pins at 1⁄10 of a 25 mm "metric inch" length, instead of the western practice of 1⁄10 of an imperial inch.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| metric inch | in (metric) | = 0.016 in | = 0.0004 m | Metric system SI |
| metric inches | chains | metric inches | chains |
|---|---|---|---|
| 1 | ≈ 1.9883838614812E-5 | 4 | ≈ 7.9535354459249E-5 |
| 1.5 | ≈ 2.9825757922218E-5 | 4.5 | ≈ 8.9477273766655E-5 |
| 2 | ≈ 3.9767677229625E-5 | 5 | ≈ 9.9419193074061E-5 |
| 2.5 | ≈ 4.9709596537031E-5 | 5.5 | ≈ 0.00010936111238147 |
| 3 | ≈ 5.9651515844437E-5 | 6 | ≈ 0.00011930303168887 |
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 | metric inches | chains | metric inches |
|---|---|---|---|
| 1 | ≈ 50292.1 | 4 | ≈ 201168.4 |
| 1.5 | ≈ 75438.15 | 4.5 | ≈ 226314.45 |
| 2 | ≈ 100584.2 | 5 | ≈ 251460.5 |
| 2.5 | ≈ 125730.25 | 5.5 | ≈ 276606.55 |
| 3 | ≈ 150876.3 | 6 | ≈ 301752.6 |
| metric inches | chains |
|---|---|
| 1 | ≈ 1.9883838614812 × 10-5 |
| 50,292.1 | ≈ 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 …) |