| Country | Non-Fatal | Deaths | Total |
| British Empire | 180,597 | 8,109 | 188,706 |
| France | 182,000 | 8,000 | 190,000 |
| United States | 71,345 | 1,462 | 72,807 |
| Italy | 55,373 | 4,627 | 60,000 |
| Russia | 419,340 | 56,000 | 475,340 |
| Germany | 191,000 | 9,000 | 200,000 |
| Austria-Hungary | 97,000 | 3,000 | 100,000 |
| Others | 9,000 | 1,000 | 10.000 |
| Total | 1,205,655 | 91,198 | 1,296,853 |
| British Gas Casualties: 1914-18 | Deaths | Non-Fatal |
| Chlorine | 1,976 | 164,457 |
| Mustard Gas | 4,086 | 16,526 |