Race and gender statistics from Tolkien’s Middle Earth
From the LOTR project…
The population of Middle-Earth and Aman divided by race and sex. Based on characters from the Hobbit, Lord of the Rings and the posthumously published works including Silmarillion.
Only 19 percent of the total number of characters are female with the highest percentage among Valar, Maiar and Hobbits. The low number of females is not due to lack of females in Middle-Earth but due to the fact that Tolkien did not describe many of them.
There is only one female Dwarf described, Dís. She had two sons, Fíli and Kíli, who perished in the Battle of Five Armies defending their mortally wounded uncle Thorin. It was this act that made Dís one of very few women included in Dwarven genealogies and the only one mentioned in Tolkien’s works.