Civilian casualty ratio is a way to measure how many people, who are not soldiers, are harmed during a war or other type of conflict. It is a way to measure the cost of war or violence on ordinary people who are not part of the fighting. It is calculated by comparing the number of civilians who are injured, killed, or displaced by the conflict to the number of combatants involved. To put it simply, it is a way to measure how many civilian lives were lost compared to how many soldiers were involved.