NEW YORK - The total cost of wars in Iraq, Afghanistan and Pakistan will run at least $3.7 trillion and could reach as high as $4.4 trillion, according to the research project by Brown University's Watson Institute for International Studies. In human terms, 224,000 to 258,000 people have died directly from warfare including 125,000 civilians in Iraq, the study found. Many more have died indirectly, from the loss of clean drinking water, health care and nutrition. Another 365,000 have been wounded and 7.8 million have been displaced. Some of the projects findings: While just over 6,000 were US soldiers were killed in the wars, new disability claims continue to pour in, with 550,000 just through last fall. Many deaths and injuries among US contractors have not been identified. At least 137,000 civilians have died and more will die in Afghanistan, Iraq, and Pakistan as a result of the fighting at the hands of all parties to the conflict. The armed conflict in Pakistan, which the US helps the Pakistani military fight by funding, equipping and training them, has taken as many lives as the conflict in neighbouring Afghanistan. Putting together the conservative numbers of war dead, in uniform and out, brings the total to 225,000. Millions of people have been displaced indefinitely and are living in grossly inadequate conditions. The current number of war refugees and displaced persons -- 7,800,000 -- is equivalent to all of the people of Connecticut and Kentucky fleeing their homes. The wars have been accompanied by erosions in civil liberties at home and human rights violations abroad. The human and economic costs of these wars will continue for decades, some costs not peaking until mid-century. Many of the wars costs are invisible to Americans, buried in a variety of budgets, and so have not been counted or assessed. For example, while most people think the Pentagon war appropriations are equivalent to the wars budgetary costs, the true numbers are twice that, and the full economic cost of the wars much larger yet. Conservatively estimated, the war bills already paid and obligated to be paid are $3.2 trillion in constant dollars. A more reasonable estimate puts the number at nearly $4 trillion. * As with former US wars, the costs of paying for veterans care into the future will be a sizable portion of the full costs of the war. * The ripple effects on the US economy have also been significant, including job loss and interest rate increases, and those effects have been underappreciated. * While it was promised that the US invasions would bring democracy to both countries, Afghanistan and Iraq, both continue to rank low in global rankings of political freedom, with warlords continuing to hold power in Afghanistan with US support, and Iraqi communities more segregated today than before by gender and ethnicity as a result of the war. * Serious and compelling alternatives to war were scarcely considered in the aftermath of 9/11 or in the discussion about war against Iraq. Some of those alternatives are still available to the US Catherine Lutz, head of the anthropology department at Brown and co-director of the study, said: "We decided we needed to do this kind of rigourous assessment of what it cost to make those choices to go to war. Politicians, we assumed, were not going to do that kind of assessment."