How many people were killed overall in world war 1?

World War I resulted in an estimated total of 15 to 20 million deaths, including both military personnel and civilians. Approximately 9 to 10 million soldiers lost their lives in combat or from wounds, while civilian casualties, due to military actions, famine, and disease, accounted for an additional 5 to 10 million deaths. The war also left millions more injured and affected countless families and communities worldwide.