| 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 |
| earth radius | 1.5696123057605 × 10-10R⊕ | 3.139224611521 × 10-10R⊕ | 4.7088369172814 × 10-10R⊕ | 6.2784492230419 × 10-10R⊕ | 7.8480615288024 × 10-10R⊕ | 9.4176738345629 × 10-10R⊕ | 1.0987286140323 × 10-9R⊕ | 1.2556898446084 × 10-9R⊕ | 1.4126510751844 × 10-9R⊕ | 1.5696123057605 × 10-9R⊕ | 1.7265735363365 × 10-9R⊕ | 1.8835347669126 × 10-9R⊕ | 2.0404959974886 × 10-9R⊕ | 2.1974572280647 × 10-9R⊕ | 2.3544184586407 × 10-9R⊕ | 2.5113796892168 × 10-9R⊕ | 2.6683409197928 × 10-9R⊕ | 2.8253021503689 × 10-9R⊕ | 2.9822633809449 × 10-9R⊕ | 3.139224611521 × 10-9R⊕ | 3.296185842097 × 10-9R⊕ | 3.453147072673 × 10-9R⊕ | 3.6101083032491 × 10-9R⊕ | 3.7670695338251 × 10-9R⊕ | 3.9240307644012 × 10-9R⊕ | 4.0809919949772 × 10-9R⊕ | 4.2379532255533 × 10-9R⊕ | 4.3949144561293 × 10-9R⊕ | 4.5518756867054 × 10-9R⊕ | 4.7088369172814 × 10-9R⊕ | 4.8657981478575 × 10-9R⊕ | 5.0227593784335 × 10-9R⊕ | 5.1797206090096 × 10-9R⊕ | 5.3366818395856 × 10-9R⊕ | 5.4936430701617 × 10-9R⊕ | 5.6506043007377 × 10-9R⊕ | 5.8075655313138 × 10-9R⊕ | 5.9645267618898 × 10-9R⊕ | 6.1214879924659 × 10-9R⊕ | 6.2784492230419 × 10-9R⊕ | 6.435410453618 × 10-9R⊕ | 6.592371684194 × 10-9R⊕ | 6.7493329147701 × 10-9R⊕ | 6.9062941453461 × 10-9R⊕ | 7.0632553759221 × 10-9R⊕ | 7.2202166064982 × 10-9R⊕ | 7.3771778370742 × 10-9R⊕ | 7.5341390676503 × 10-9R⊕ | 7.6911002982263 × 10-9R⊕ | 7.8480615288024 × 10-9R⊕ | 8.0050227593784 × 10-9R⊕ | 8.1619839899545 × 10-9R⊕ | 8.3189452205305 × 10-9R⊕ | 8.4759064511066 × 10-9R⊕ | 8.6328676816826 × 10-9R⊕ | 8.7898289122587 × 10-9R⊕ | 8.9467901428347 × 10-9R⊕ | 9.1037513734108 × 10-9R⊕ | 9.2607126039868 × 10-9R⊕ | 9.4176738345629 × 10-9R⊕ | 9.5746350651389 × 10-9R⊕ | 9.731596295715 × 10-9R⊕ | 9.888557526291 × 10-9R⊕ | 1.0045518756867 × 10-8R⊕ | 1.0202479987443 × 10-8R⊕ | 1.0359441218019 × 10-8R⊕ | 1.0516402448595 × 10-8R⊕ | 1.0673363679171 × 10-8R⊕ | 1.0830324909747 × 10-8R⊕ | 1.0987286140323 × 10-8R⊕ | 1.1144247370899 × 10-8R⊕ | 1.1301208601475 × 10-8R⊕ | 1.1458169832051 × 10-8R⊕ | 1.1615131062628 × 10-8R⊕ | 1.1772092293204 × 10-8R⊕ | 1.192905352378 × 10-8R⊕ | 1.2086014754356 × 10-8R⊕ | 1.2242975984932 × 10-8R⊕ | 1.2399937215508 × 10-8R⊕ | 1.2556898446084 × 10-8R⊕ | 1.271385967666 × 10-8R⊕ | 1.2870820907236 × 10-8R⊕ | 1.3027782137812 × 10-8R⊕ | 1.3184743368388 × 10-8R⊕ | 1.3341704598964 × 10-8R⊕ | 1.349866582954 × 10-8R⊕ | 1.3655627060116 × 10-8R⊕ | 1.3812588290692 × 10-8R⊕ | 1.3969549521268 × 10-8R⊕ | 1.4126510751844 × 10-8R⊕ | 1.428347198242 × 10-8R⊕ | 1.4440433212996 × 10-8R⊕ | 1.4597394443572 × 10-8R⊕ | 1.4754355674148 × 10-8R⊕ | 1.4911316904725 × 10-8R⊕ | 1.5068278135301 × 10-8R⊕ | 1.5225239365877 × 10-8R⊕ | 1.5382200596453 × 10-8R⊕ | 1.5539161827029 × 10-8R⊕ | 1.5696123057605 × 10-8R⊕ |
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 | earth radius | millimeters | earth radius |
|---|---|---|---|
| 1 | ≈ 1.5696123057605E-10 | 4 | ≈ 6.2784492230419E-10 |
| 1.5 | ≈ 2.3544184586407E-10 | 4.5 | ≈ 7.0632553759221E-10 |
| 2 | ≈ 3.139224611521E-10 | 5 | ≈ 7.8480615288024E-10 |
| 2.5 | ≈ 3.9240307644012E-10 | 5.5 | ≈ 8.6328676816826E-10 |
| 3 | ≈ 4.7088369172814E-10 | 6 | ≈ 9.4176738345629E-10 |
Earth radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by R⊕.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| earth radius | R⊕ | ≈ 6,371 km | ≈ 6,371 km | Science - Astronomy (Length) |
| earth radius | millimeters | earth radius | millimeters |
|---|---|---|---|
| 1 | ≈ 6371000000 | 4 | ≈ 25484000000 |
| 1.5 | ≈ 9556500000 | 4.5 | ≈ 28669500000 |
| 2 | ≈ 12742000000 | 5 | ≈ 31855000000 |
| 2.5 | ≈ 15927500000 | 5.5 | ≈ 35040500000 |
| 3 | ≈ 19113000000 | 6 | ≈ 38226000000 |
| millimeters | earth radius |
|---|---|
| 1 | ≈ 1.5696123057605 × 10-10 |
| 6 371 000 000 | ≈ 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 …) |