210 mm = 21 cm. To convert millimeters to centimeters, divide by 10: 210 ÷ 10 = 21.
How to convert millimeters to centimeters
cm = mm × 0.1
- 1 mm = 0.1 cm (and 1 cm = 10 mm).
- Multiply the amount by the factor: 210 × 0.1 = 21.
- Answer: 210 mm = 21 cm.
Shortcut: dividing by 10 gives the same result as multiplying by 0.1.
Millimeters to Centimeters table
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 205 mm | 20.5 cm |
| 206 mm | 20.6 cm |
| 207 mm | 20.7 cm |
| 208 mm | 20.8 cm |
| 209 mm | 20.9 cm |
| 210 mm | 21 cm |
| 211 mm | 21.1 cm |
| 212 mm | 21.2 cm |
| 213 mm | 21.3 cm |
| 214 mm | 21.4 cm |
| 215 mm | 21.5 cm |
| mm | cm |
|---|---|
| 1 mm | 0.1 cm |
| 5 mm | 0.5 cm |
| 10 mm | 1 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
| 1,000 mm | 100 cm |
Good to know
1 inch = 2.54 cm exactly; 1 cm = 10 mm; 1 m = 100 cm; 1 foot = 12 inches = 30.48 cm.