897,000 Circassians were deported and killed in an event similar in time period and method to this one and of those about 45% died. ("Caucasus Report: July 15, 2005". Radio Free Europe.) if this is applied to the median of the following rough estimates and then rounded down (Since this a very rough estimate anyway) you will end up with a very rough estimate of 400,000 killed.

(795,000+993,600=1,788,600

1,788,600÷2=894,300

894,300×0.45=402,435

402,435 round to 400,000)

This comparative method of finding death toll was used by "democide" analyst R.J.Rummel to find the death toll for the Hacienda and Chattel slavery system in Mexico:

https://www.hawaii.edu/powerkills/SOD.CHAP11.HTM

following estimates:

low estimate In 1893 the Hazaras of Afghanistan were massacred and displaced to a point in which they lost over 60% of their population. The number of living Hazaras at the time is unknown but their population in 2014 was 2,864,056. 2,864,056 population out of a 2014 world population of 7,200,000,000 making Hazaras in Afghanistan approximately 0.04% of the world's population.
دلجو, عباس (2014). تاریخ باستانی هزاره ها. کابل: انتشارات امیری. ISBN 9936801504.
"Afghanistan: 31,822,848 (July 2014 est.) @ 9% (2014)". The World Factbook. Central Intelligence Agency. Retrieved July 17, 2015.
http://www.prb.org/Publications/Datasheets/2014/2014-world-population-data-sheet/data-sheet.aspx
World population estimates#Before 1950
The population of the world in 1892-93 is unknown but there are estimates for years that are close to these: In 1875, the world population was estimated to be 1,325,000,000. If the Hazara proportion is applied to this population there were roughly 530,000 Hazaras at the time. Since the Hazaras have already lost 60% of their population is likely 250% of this or 1,325,000. 60% of 1,325,000 is 795,000.

high estimate In 1893 the Hazaras of Afghanistan were massacred to a point in which they lost over 60% of their population. The number of living Hazaras at the time is unknown but their population in 2014 was 2,864,056. 2,864,056 population out of a 2014 world population of 7,200,000,000 making Hazara's in Afghanistan approximately 0.04% of the world's population.
دلجو, عباس (2014). تاریخ باستانی هزاره ها. کابل: انتشارات امیری. ISBN 9936801504.
"Afghanistan: 31,822,848 (July 2014 est.) @ 9% (2014)". The World Factbook. Central Intelligence Agency. Retrieved July 17, 2015.
http://www.prb.org/Publications/Datasheets/2014/2014-world-population-data-sheet/data-sheet.aspx
World population estimates#Before 1950
The population of the world in 1892-93 is unknown but there are estimates for years that are close to these: In 1900 the world population was estimated to be 1,656,000,000. If the Hazara proportion is applied to this population there were roughly 662,400 Hazaras at the time. Since the Hazaras had already lost 60% of their population at the time the death and displacement toll would be 150% of this making it 993,600.

45% of 60% is 27% hence more than a quarter