Chart of U-boat losses 1939-1945
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |
| 1939 | 2 | 5 | 1 | 1 | 9 | ||||||||
| 1940 | 2 | 5 | 3 | 4 | 1 | 1 | 2 | 2 | 1 | 1 | 2 | 24 | |
| 1941 | 5 | 2 | 1 | 4 | 4 | 2 | 2 | 5 | 10 | 35 | |||
| 1942 | 3 | 2 | 7 | 2 | 4 | 3 | 12 | 9 | 10 | 16 | 13 | 5 | 86 |
| 1943 | 7 | 18 | 15 | 17 | 42 | 16 | 38 | 25 | 10 | 26 | 19 | 8 | 241 |
| 1944 | 14 | 22 | 24 | 21 | 23 | 24 | 23 | 32 | 20 | 9 | 7 | 15 | 234 |
| 1945 | 14 | 21 | 29 | 48 | 24 | 136 | |||||||
| Total U-boats lost | 765 | ||||||||||||
These figures count all U-boats "lost" to the Kriegsmarine. That includes air attacks in harbours, training accidents, accidents at sea and 2 boats interned in neutral countries. In short, any event which cost the German Navy a U-boat for good (i.e. the boat was not re-floated and re-commissioned to fight again).
Excluded are boats surrendered or scuttled in May 1945 and boats that had been paid off earlier in the war (decommissioned).
Notes
- U-31 was sunk twice in 1940, March 11 and November 2.
- May 1942. Including U-573 which was interned in Spain after air attack.
- Jul 1944. Including U-1164 and U-872 destroyed during air raids.
- Aug 1944. Including 7 boats scuttled at their bases after to prevent capture.
- Sep 1944. Including 3 boats scuttled in the Black Sea near Turkey.
- Oct 1944. Including 2 boats sunk in an air attack on Bergen, Norway.