World War II was the deadliest military conflict in history.An estimated total of 70–85 million people perished, which was about 3% of the 1940 world population (est. 2.3 billion). The tables below give a detailed country-by-country count of human losses.
See estimates for worldwide deaths, broken down by country, in World War II.
World War 2 was the bloodiest conflict in human history. There were more than 60 million World War 2 casualties resulting in death which at the time was more than 2.5% of the overall world population. The war was notable for the Nazi-sponsored genocide of the Jewish peoples resulting in more than 5.9 million deaths, and the impact of "Total War" on the world's population.
Number of deaths of the Second World War by country, on a real scale. -Music: Space Coast - Topher Mohr and Alex Elena -Source: https://www.nationalww2museum...
World War 2 Casualties. Here we offer detailed break-down of World War 2 Casualties listed by country. Please note that the figures in this table are unofficial estimates obtained from various sources.
World War II was the deadliest military conflict in history in absolute terms of total casualties. Over 60 million people were killed, which was about 3% of the 1940 world population (est. 2.3 billion).  The tables below give a detailed country-by-country count of human losses.
Casualties listed here include about 4 to 12 million war-related famine deaths in China, Indonesia, Vietnam, the Philippines, India, and Bangladesh that are often omitted from other compilations of World War II casualties. Human losses by country
In terms of total numbers, the Soviet Union bore an incredible brunt of casualties during WWII. An estimated 16,825,000 people died in the war, over 15% of its population.
About 1.2 million Austrians served in all branches of the German armed forces during World War II. After the defeat of the Axis Powers, the Allies occupied Austria in four occupation zones set up at the end of World War II until 1955, when the country again became a fully independent republic under the condition that it remained neutral.
Source: The Road to World War II: How Appeasement Failed to Stop Hitler, Der Spiegel At 0.30%, the U.S. had the lowest death toll percentage as a percentage of total population at that time. This does not mean American sacrifices were small compared to other countries.