| 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 |
| micron | 1 000 μm | 2 000 μm | 3 000 μm | 4 000 μm | 5 000 μm | 6 000 μm | 7 000 μm | 8 000 μm | 9 000 μm | 10 000 μm | 11 000 μm | 12 000 μm | 13 000 μm | 14 000 μm | 15 000 μm | 16 000 μm | 17 000 μm | 18 000 μm | 19 000 μm | 20 000 μm | 21 000 μm | 22 000 μm | 23 000 μm | 24 000 μm | 25 000 μm | 26 000 μm | 27 000 μm | 28 000 μm | 29 000 μm | 30 000 μm | 31 000 μm | 32 000 μm | 33 000 μm | 34 000 μm | 35 000 μm | 36 000 μm | 37 000 μm | 38 000 μm | 39 000 μm | 40 000 μm | 41 000 μm | 42 000 μm | 43 000 μm | 44 000 μm | 45 000 μm | 46 000 μm | 47 000 μm | 48 000 μm | 49 000 μm | 50 000 μm | 51 000 μm | 52 000 μm | 53 000 μm | 54 000 μm | 55 000 μm | 56 000 μm | 57 000 μm | 58 000 μm | 59 000 μm | 60 000 μm | 61 000 μm | 62 000 μm | 63 000 μm | 64 000 μm | 65 000 μm | 66 000 μm | 67 000 μm | 68 000 μm | 69 000 μm | 70 000 μm | 71 000 μm | 72 000 μm | 73 000 μm | 74 000 μm | 75 000 μm | 76 000 μm | 77 000 μm | 78 000 μm | 79 000 μm | 80 000 μm | 81 000 μm | 82 000 μm | 83 000 μm | 84 000 μm | 85 000 μm | 86 000 μm | 87 000 μm | 88 000 μm | 89 000 μm | 90 000 μm | 91 000 μm | 92 000 μm | 93 000 μm | 94 000 μm | 95 000 μm | 96 000 μm | 97 000 μm | 98 000 μm | 99 000 μm | 100 000 μm |
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 | micron | millimeters | micron |
|---|---|---|---|
| 1 | ≡ 1000 | 4 | ≡ 4000 |
| 1.5 | ≡ 1500 | 4.5 | ≡ 4500 |
| 2 | ≡ 2000 | 5 | ≡ 5000 |
| 2.5 | ≡ 2500 | 5.5 | ≡ 5500 |
| 3 | ≡ 3000 | 6 | ≡ 6000 |
The micron (SI symbol: μm) or micrometer is an SI derived unit of length equaling 1×10−6 of a metre (SI standard prefix "micro-" = 10−6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| micron | μm | ≡ 1×10−6 m | ≡ 1×10−6 m | Metric system Non-SI |
| micron | millimeters | micron | millimeters |
|---|---|---|---|
| 1 | ≡ 0.001 | 4 | ≡ 0.004 |
| 1.5 | ≡ 0.0015 | 4.5 | ≡ 0.0045 |
| 2 | ≡ 0.002 | 5 | ≡ 0.005 |
| 2.5 | ≡ 0.0025 | 5.5 | ≡ 0.0055 |
| 3 | ≡ 0.003 | 6 | ≡ 0.006 |
| millimeters | micron |
|---|---|
| 1 | ≡ 1 000 |
| 0.001 | ≡ 1 |
You can find the conversion in other languages in the following:
| 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 …) |