The staggering figure could reach as high as $4.4trillion, with the deaths of up to 258,000 people, according to research 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.
Many more have died indirectly, from the loss of clean drinking water, health care and nutrition.
Another 365,000 have been wounded and 7.8million - the combined population of Connecticut and Kentucky - have been displaced.
In the 10 years since U.S. troops went into Afghanistan to root out the Al Qaeda leaders behind the September 11, 2001, attacks, spending on the conflicts totalled up to $2.7 trillion.
Those numbers will continue to soar when considering often overlooked costs including obligations to wounded veterans and projected war spending from 2012 through 2020.
They also do not include at least $1trillion in interest payments and expenses. Read More