The figure that most experts give for the Jews, gypsies,
and others who were exterminated in the camps is about
6 million. John Keegan, British historian, whose recent
book on the First World War claims that about 10 million
died in the Great War and about 40 million in the Second.
You speak about those killed "indirectly", and in the
case of both Hitler and Stalin -- you can extrapolate
and guesstimate forever! For example, many historians
say that Stalin's purge of the Soviet military before
the war and his failure to adequately prepare for
invasion (despite many warnings) cost the lives of
millions of Soviet troops. Dmitri Volkogonov, former
Soviet marshall and historian, says in his book (Stalin:
Triumph and Tragedy) that the 1939 pact with Hitler
really put Stalin's guard down. We're ultimately dealing
with vast numbers and how to interpret them. It was
Stalin himself who said, "One death is a tragedy; a
million is a statistic."