How many of each did we have during the war?
The number of submarines we had as combat boats, as nearly as we can determine, is approximately:
| Pre-WW2 boats | 50 |
| Gato class boats completed | 77 |
| Balao class boats completed | 119 |
| Tench class boats completed | 25 |
| Built during and right after WW2 – Gato/Balao/Tench | 221 |
| Total WW2 boats | 271 |
| Completed too late for combat: 24 Balaos and 16 Tench | 40 |
| Total combatant submarines | 231 |
| Lost to all causes | 52 |
| Percentage lost | 23% |
| Combat ready total at the end of the war | 179 |
| Total at the end of the war plus those still being tested or completed | 219 |