| millimeter | 1 mm | 2 mm | 3 mm | 4 mm | 5 mm | 6 mm | 7 mm | 8 mm | 9 mm | 10 mm | 11 mm | 12 mm | 13 mm | 14 mm | 15 mm | 16 mm | 17 mm | 18 mm | 19 mm | 20 mm | 21 mm | 22 mm | 23 mm | 24 mm | 25 mm | 26 mm | 27 mm | 28 mm | 29 mm | 30 mm | 31 mm | 32 mm | 33 mm | 34 mm | 35 mm | 36 mm | 37 mm | 38 mm | 39 mm | 40 mm | 41 mm | 42 mm | 43 mm | 44 mm | 45 mm | 46 mm | 47 mm | 48 mm | 49 mm | 50 mm | 51 mm | 52 mm | 53 mm | 54 mm | 55 mm | 56 mm | 57 mm | 58 mm | 59 mm | 60 mm | 61 mm | 62 mm | 63 mm | 64 mm | 65 mm | 66 mm | 67 mm | 68 mm | 69 mm | 70 mm | 71 mm | 72 mm | 73 mm | 74 mm | 75 mm | 76 mm | 77 mm | 78 mm | 79 mm | 80 mm | 81 mm | 82 mm | 83 mm | 84 mm | 85 mm | 86 mm | 87 mm | 88 mm | 89 mm | 90 mm | 91 mm | 92 mm | 93 mm | 94 mm | 95 mm | 96 mm | 97 mm | 98 mm | 99 mm | 100 mm |
| rod | 0.0001988 rd | 0.0003977 rd | 0.0005965 rd | 0.0007954 rd | 0.0009942 rd | 0.0011930 rd | 0.0013919 rd | 0.0015907 rd | 0.0017895 rd | 0.0019884 rd | 0.0021872 rd | 0.0023861 rd | 0.0025849 rd | 0.0027837 rd | 0.0029826 rd | 0.0031814 rd | 0.0033803 rd | 0.0035791 rd | 0.0037779 rd | 0.0039768 rd | 0.0041756 rd | 0.0043745 rd | 0.0045733 rd | 0.0047721 rd | 0.0049710 rd | 0.0051698 rd | 0.0053686 rd | 0.0055675 rd | 0.0057663 rd | 0.0059652 rd | 0.0061640 rd | 0.0063628 rd | 0.0065617 rd | 0.0067605 rd | 0.0069594 rd | 0.0071582 rd | 0.0073570 rd | 0.0075559 rd | 0.0077547 rd | 0.0079536 rd | 0.0081524 rd | 0.0083512 rd | 0.0085501 rd | 0.0087489 rd | 0.0089477 rd | 0.0091466 rd | 0.0093454 rd | 0.0095443 rd | 0.0097431 rd | 0.0099419 rd | 0.0101408 rd | 0.0103396 rd | 0.0105385 rd | 0.0107373 rd | 0.0109361 rd | 0.0111350 rd | 0.0113338 rd | 0.0115326 rd | 0.0117315 rd | 0.0119303 rd | 0.0121292 rd | 0.0123280 rd | 0.0125268 rd | 0.0127257 rd | 0.0129245 rd | 0.0131234 rd | 0.0133222 rd | 0.0135210 rd | 0.0137199 rd | 0.0139187 rd | 0.0141176 rd | 0.0143164 rd | 0.0145152 rd | 0.0147141 rd | 0.0149129 rd | 0.0151117 rd | 0.0153106 rd | 0.0155094 rd | 0.0157083 rd | 0.0159071 rd | 0.0161059 rd | 0.0163048 rd | 0.0165036 rd | 0.0167025 rd | 0.0169013 rd | 0.0171001 rd | 0.0172990 rd | 0.0174978 rd | 0.0176967 rd | 0.0178955 rd | 0.0180943 rd | 0.0182932 rd | 0.0184920 rd | 0.0186908 rd | 0.0188897 rd | 0.0190885 rd | 0.0192874 rd | 0.0194862 rd | 0.0196850 rd | 0.0198839 rd |
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. Therefore there are thousand millimetres in a metre. There are ten millimetres in a centimetre.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| millimeter | mm | ≡ 1×10-3 m ≡ 0.001 m | ≡ 1×10-3 m ≡ 0.001 m | Metric system SI |
| millimeters | rods | millimeters | rods |
|---|---|---|---|
| 1 | = 0.00019883878151595 | 4 | = 0.00079535512606379 |
| 1.5 | = 0.00029825817227392 | 4.5 | = 0.00089477451682176 |
| 2 | = 0.00039767756303189 | 5 | = 0.00099419390757973 |
| 2.5 | = 0.00049709695378987 | 5.5 | = 0.0010936132983377 |
| 3 | = 0.00059651634454784 | 6 | = 0.0011930326890957 |
The rod or perch or pole is a surveyors tool and unit of length equal to 5 1⁄2 yards, 16 1⁄2 feet, 1⁄320 of a statute mile or one-fourth of a surveyor's chain and 5.0292 meters.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| rod | rd | ≡ 16 1⁄2 ft | = 5.0292 m | Imperial/US |
| rods | millimeters | rods | millimeters |
|---|---|---|---|
| 1 | = 5029.2 | 4 | = 20116.8 |
| 1.5 | = 7543.8 | 4.5 | = 22631.4 |
| 2 | = 10058.4 | 5 | = 25146 |
| 2.5 | = 12573 | 5.5 | = 27660.6 |
| 3 | = 15087.6 | 6 | = 30175.2 |
| millimeters | rods |
|---|---|
| 1 | = 0.0001988 |
| 5,029.2 | = 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 …) |