1 British and Neutral Merchant Tonnage Sunk (1,000 tons) – by Cause
| Britain | 7,760 |
| Norway | 1,177 |
| France | 889 |
| Italy | 846 |
| USA | 395 |
| Other Countries | 1,785 |
| Total | 12,852 |
2 Entente and Neutral Merchant Tonnage Sunk (1,000 tons) – By Country
| Germany | 187 |
| Turkey | 62 |
| Austria-Hungary | 15 |
| Total | 264 |
3 Central Powers Merchant Tonnage Sunk (1,000 tons) – By Country
4 U-Boat Losses 1914-1918
| Rank | Name | 1,000 tons |
| KK | Lothar von Arnauld de la Periere | 400 |
| KL | Walther Forstmann | 380 |
| KK | Max Valentiner | 300 |
| KL | Hans Rose | 210 |
| KL | Otto Streinbrink | 210 |
| KL | Waldemar Kophamel | 190 |
| KL | Walther Schweiger | 190 |
| KL | Hans von Mellenthin | 170 |
| KL | Claus Rücker | 170 |
| KL | Otto Wünsche | 160 |
| OL | Reinhold Salzwedel | 150 |
| OL | Wolfgang Steinbauer | 140 |
| KL | Konrad Gansser | 140 |
| KL | Robert Moraht | 130 |
| KL | Willhelm Werner | 130 |
| KL | Leo Hillebrand | 130 |
| KL | Otto Schultze | 130 |
| KL | Rudolf Schneider | 130 |
| KL | Ernst Hashagen | 130 |
| KL | Kurt Hartwig | 130 |
5 Top Twenty U-Boat Aces 1914-1918
Savereo John 2017
Savereo John History 