While principally a .303-inch (7.7mm) gun, the Vickers mechanism was transferred into many different calibres and used by many different countries around the World.
The complete range of calibres in which the Vickers produced or used is:
| Metric calibre (mm) | Description |
| 6.5 | Italian |
| 6.5 x 51 | Japanese Type 38 |
| 6.5 x 54 R | Dutch |
| 7 x 57 | Mauser |
| 7.11 | Canadian (.280-inch) |
| 7.5 x 55 | Swiss |
| 7.62 x 51 | NATO |
| 7.62 x 54 R | Russian |
| 7.62 x 63 | .30-06 |
| 7.65 x 53 R | Mauser |
| 7.7 | British (.303-inch) |
| 7.7 x 58 SR | Japanese Type 89 |
| 7.92 x 57 | German |
| 7.92 x 57R | Dutch |
| 8 | Danish |
| 8 | Lebel |
| 8 x 52 R | Siamese |
| 11 x 59 R | Gras |
| 12.7 x 81 | v/580 |
| 12.7 x 81 SR | v/565 |
| 12.7 x 120 SR | v/664 & v/690 |
| 13.9 x 99 R | .55-inch |
| 16.8 x 149 SR | .661-inch |
| 25.4 | 1-inch |
| 37 x 61 | 1-pdr |
| 37 x 69 R | 1-pdr |
| 40 x 158 R | Class 'S' |
The following abbreviations are used in the above table: