Geom. mean estimate[1] Lowest estimate Highest estimate Event Location From To Duration (years) Notes, See also 7007743303440000000♠74,330,344[2] 7007650000000000000♠65,000,000[3] 7007850000000000000♠85,000,000[4] World War II Worldwide 7003193900000000000♠1939 7003194500000000000♠1945 7000603000000000000♠6 years and 1 day World War II casualties (includes worldwide Holocaust and concentration camps deaths).