Blaming Hitler for 6 million deaths is probably a considerable under estimate.

The holocaust alone killed something like 5.9 million Jews; but they were by no means the only group subject to extermination, and the total number of people systematically murdered was more like 10 or 11 million.

If you account WWII as starting in 1939 (a pretty reasonable case can be made for earlier dates, such as the Japanese invasion of Manchuria, or the Italian invasion of Abyssinia; or indeed, one might argue that Versaille was merely a 20 year armistice) then the total death-toll was probably in excess of 60 million.

Obviously, by no means all of these casualties may be attributed to Hitler; for example, the Pacific war was largely independent of the European war.

It is also reasonable to suppose that there would have been some kind of German war following WWI even had Hitler never been born, because the general political environment in Germany was predisposed in that direction; Hitler wasn't even the first Nazi.

But, for the purposes of this sort of argument, it is probably not entirely unreasonable to account the Holocaust as Hitler's unique contribution to the sum of human misery, and round this to 10 million for mathematical simplicity.

Thus,

1 Hitler = 10 Mega Deaths

How one then chooses to account the value of human life for financial purposes is an extremely vexatious question, because of inflation, increasing productivity, and the thorny question of population control (killing somebody reduces the world's population by 1 today, but, on the one hand, that person might have had multiple offspring, yet on the other, total population is limited by various factors, both Malthusian and political, such that the effects of a single death today upon total world output a century from now are not obvious).

This is illustrated by the fact that there are roughly as many figures placed upon the value of human life as there are agencies making use of such figures.

It is also worth pointing out that most estimations of the value of human life are used for decidedly local accounting decisions (such as whether money should be spent improving a road junction).

This clearly does not read across to WWII at all.

It is perhaps less unreasonable to calculate the GDP per capita and then multiply this by the death toll, and some reasonable mean remaining life expectancy figure.

World GDP was about 63·10¹² USD in 2010; as world population was between 6 and 7·10⁹ during that period, and the margins of error on these figures tend to be large anyway, it's probably not a million miles out to call the average GDP per capita 10³ USD per year.

If we then assume that about 20 years of working life are lost on average, and assume growth exceeding inflation of 3% per year, we end up with a quite interesting calculation.

The normal compound interest calculation with addition assumes that the addition is fixed each year; in this case, the contribution grows with GDP.

You therefore get a progression like this

1. 0 Principle + 0 Interest on principle + 1000 Contribution
2. 1000 + 1000·i + (1000)(1+i)¹
3. (1000 + 1000·i + (1000)(1+i)¹⁾ + (1000 + 1000·i + (1000)(1+i)^1)·i + (1000)(1+i)²
4. etc...

This grows dramatically faster than conventional compound interest.

• If we assume a growth rate of 3%, the 20 year value is about 7.32·10⁵ USD;
• if we assume a growth rate of 3.5%, the value becomes about 1.6·10⁶ USD;
• If we assume a growth rate of 4%, the value becomes about 3.59·10⁶ USD
• Things then rapidly disappear into the long grass!

Note that this calculation has been dramatically simplified by considering only growth in excess of inflation and no discount rate.

Because this whole thing is an exercise in approximation and round numbers, we might as well assume a 20 year value of about 10⁶ USD, because this is would be the result of a somewhat reasonable growth rate.

This figure is rather impressive, but it's probably an over-estimate of the economic cost of removing an individual from the population, due to the fact that the wider economy is likely to take up the slack, at least to some extent (though of course, its ability to do so decreases the more people are removed - in the limit, if everybody dies, growth must be zero).

For the sake of argument, it's probably reasonable to halve the rather large figure calculated; in which case we arrive at 0.5·10⁶ USD per death, and therefore

1 International Hitler = -5·10¹² USD(2010)

For perspective, US GDP in 2010 was about 14.58·10¹² USD.