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21 centimeters (cm) = 210 millimeters (mm). To convert 21 cm to mm, multiply the length value by the conversion factor 10.
Number of centimeters × 10 = Value in millimeters
21 cm = 21 × 10 = 210 mm
| Centimeters [cm] | Millimeters [mm] |
| 21 | 210 |
| 22 | 220 |
| 23 | 230 |
| 24 | 240 |
| 25 | 250 |
| 26 | 260 |
| 27 | 270 |
| 28 | 280 |
| 29 | 290 |
| 30 | 300 |
| 31 | 310 |
| 32 | 320 |
| 33 | 330 |
| 34 | 340 |
| 35 | 350 |
| 36 | 360 |
| 37 | 370 |
| 38 | 380 |
| 39 | 390 |
| 40 | 400 |
How many millimeters are there in a centimeter?
There are 10 millimeters in a centimeter.
Which is the bigger unit?
Centimeter is the bigger unit than millimeter.