Cannot answer, but I can list some of the variables it depends on:
etc.
The Tzar Bomba (a 50MTon bomb, largest ever exploded) if detonated at optimal airburst altitude would have a blast radius of 60 miles! How many cities in a modern metropolitan area do you think that would eliminate?
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See "related links" below. Immediate casualties were 220k. Another interesting attack was the fire bombing of Dresden. 40k. See link below.
A nuclear bomb can destroy a city and the surrounding area. Think if New York City was bomb with an atom bomb. 8 million plus people would be killed instantly and milions more would die from the fallout or burns or other injuries. Injuries would be in the millions too.
8000
A large nuclear war could kill the entire population of the world (which is currently about seven billion people) but there could also be a smaller nuclear war, which might kill only a few million people.
Many people would agree that the only pro of dropping the bomb on Hiroshima was that it ended the war. Thirty percent of the population of Hiroshima were killed by the bombing.
The atomic bomb was dropped over Hiroshima on August 6 1945 and killed an estimate of 90,000-166,000 persons.