Here is some information for you. Some others go as far as 95 million but the amount is not that important to me.
Thank you for posting a link. While it gives something of an accounting, I am inclined to take the list with a heavy grain of salt.
The author, David A. Plaisted, is a professor of Computer Science at UNC. Hardly an historian.
His list comprises 9 chapters, taken from 13 cited sources (and others that, for whatever reason, are not cited). There is at least one error in the list of sources as well - “The History of the Ancient Christians” by Perrin is cited as being written in 1618, however it was actually authored in 1847 and is titled “History of the Ancient Christians inhabiting the valleys of the Alps”. A facsimile of the edition originally belonging to the New York Public Library is available on Google Books.
So of these 13 cited, 12 were written after 1830 by American Protestants. Of these 12, 7 were written during a time of Nativist sentiment against Catholic immigrants that at times exploded in violence (as in the Philadelphia riots of 1844). This Nativism voiced itself politically as well, through the Know-Nothing Party, through support for the Ku Klux Klan and its lynchings, and through various local and national movements to prohibit Catholics from holding office, settling in the West, or even bringing a Bible translation other than the KJV into public schools.
Even looking at the titles of the sources - “Popery the Enemy of Civil and Religious Liberty”, “The American Textbook of Popery”, “History of Romanism” - I wonder whether these historical sources at best describe the anti-Catholic sentiment of the mid-19th to mid-20th century, rather than anything that actually occured before the United States came into existence.
I also wonder how a professor - in any good conscience - could use such questionable sources in putting forth an argument. Perhaps he is a good mathematician, but his critical reasoning skills are awful.
So you have given me a document, written by a non-historian, based predominantly upon a list of polemically-motivated, incitatory sources written for the purpose of arousing anti-Catholic sentiment, written by people who are not historians, who do not consult primary historical sources. I am not surprised that these not only include lists of deaths allegedly caused by the Catholic Church, but I am also not surprised that they vary so greatly in scope. To have estimates that vary from 50 million to 150 million calls into question the techniques used to measure and account for deaths, or even whether such techniques were actually used.
As I read the document, I find the author generally accepts wholesale whatever these 19th century non-historians argued was the number. He does not - surprisingly, for a computer science professor - utilize any sort of sampling technique nor evaluate the techniques used by his source.
As a statistician - one who actually performs numerical analysis for a living - I am astonished by his sixth chapter - “An estimate based on population growth” - which uses entirely rudimentary methods to estimate rates of population growth and the impact of persecutions upon that growth.
So I’m wondering whether it’s even worth it to build an accounting table from this document.
It’s also interesting that the author goes to great pains to attempt to tie Albigensians, Waldensians and Bogomils as some historic ‘lost thread’ or ‘hidden church’. I will say that of all the heretical groups persecuted, the Waldensians probably deserved it the least - but I don’t think you can argue that the Bogomils or Albigensians were your precursors and still adhere to a Christian theology. These latter groups were subsets of Catharism, which viewed the God of the Old Testament as Satan and saw the Father and the Son in conflict with one another. Salvation for a Catharii meant sloughing off physical matter - and so marriage was forbidden, starving oneself was seen as a good thing, and suicide was welcomed. Surely you don’t hold to such doctrines today? If one cites such a theology as part of one’s theological history, how does one get from Scripture to today in an unbroken method?