Cenepa War
Figures given for losses during the Cenepa War vary widely, especially regarding human casualties. Ecuadorian military sources put the casualties at 34 killed recognized by Comando Conjunto de las FFAA del Ecuador and 154 killed and wounded recognized by Asociación de ex combatientes del Cenepa, Quito, Ecuador. As of February 2005, an Ecuadorian Cenepa war veterans' association had a membership of 131 ex-combatants, some of them with long-term health disorders caused by the war.
ALDHU, a human rights NGO, has put the total number of mortal casualties for both sides at around 500. This figure was also given by Ecuadorian senior officers after the war, reflecting the fact that Peruvians found themselves attacking well-protected Ecuadorian positions and subjected to continuous ambushes and well-aimed artillery and rocket fire from the heights of the Condor range.
Paraguayan War
A 1999 study by Thomas Whigham from the University of Georgia and Barbara Potthast (published in the "Latin American Research Review" under the title "The Paraguayan Rosetta Stone: New Evidence on the Demographics of the Paraguayan War, 1864–1870", and later expanded in the 2002 essay titled "Refining the Numbers: A Response to Reber and Kleinpenning") has a methodology to yield more accurate figures. To establish the population before the war, Whigham used an 1846 census and calculated, based on a population growth rate of 1.7% to 2.5% annually (which was the standard rate at that time), that the immediately pre-war Paraguayan population in 1864 was approximately 420,000–450,000. Based on a census carried out after the war ended, in 1870–1871, Whigham concluded that 150,000–160,000 Paraguayan people had survived, of whom only 28,000 were adult males. In total, 60%–70% of the population died as a result of the war, leaving a woman/man ratio of 4 to 1 (as high as 20 to 1, in the most devastated areas). For academic criticism of the Whigham-Potthast methodology and estimates see the main article Paraguayan War casualties.
Of approximately 123,000 Brazilians who fought in the Paraguayan War, the best estimates are around 50,000 men died. Uruguay had about 5,600 men under arms (including some foreigners), of whom about 3,100 died. Argentina lost close to 30,000 men.