| 421 millimeters in kilometers | 0.000421 kms |
| 421 millimeters in meters | 0.421 ms |
| 421 millimeters in decimeters | 4.21 dms |
| 421 millimeters in centimeters | 42.1 cms |
| 421 millimeters in miles | 0 mis |
| 421 millimeters in yards | 0.46040981 yds |
| 421 millimeters in feet | 1.38123364 fts |
| 421 millimeters in inches | 16.5748121 in |
| 421 millimeters in nautical miles | 0.000227321897 NM |
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