How many died on D-Day, June 6, 1944?

“In April and May 1944, the Allied air forces lost nearly 12,000 men and over 2,000 aircraft in operations which paved the way for D-Day.

The Allied casualties figures for D-Day have generally been estimated at 10,000, including 2500 dead. Broken down by nationality, the usual D-Day casualty figures (killed, wounded, MIA) are approximately 2700 British, 946 Canadians, and 6603 Americans. . .

The total German casualties on D-Day are not known, but are estimated as being between 4000 and 9000 men. . .

Over 425,000 Allied and German troops were killed, wounded or went missing during the Battle of Normandy. This figure includes over 209,000 Allied casualties, with nearly 37,000 dead amongst the ground forces and a further 16,714 deaths amongst the Allied air forces. Of the Allied casualties, 83,045 were from 21st Army Group (British, Canadian and Polish ground forces), 125,847 from the US ground forces. The losses of the German forces during the Battle of Normandy can only be estimated. Roughly 200,000 German troops were killed or wounded. The Allies also captured 200,000 prisoners of war (not included in the 425,000 total, above). During the fighting around the Falaise Pocket (August 1944) alone, the Germans suffered losses of around 90,000, including prisoners.

http://www.ddaymuseum.co.uk/d-day/d-day-and-the-battle-of-normandy-your-questions-answered