EUR7.8bn bill for wars.
Financial experts believe America will end up paying almost EUR1.76trillion by 2017.
US troops are entering their sixth year in Iraq following the 2003 invasion and the fall of Saddam Hussein.
Experts said while the cost in lives has fallen in recent months due to a "surge" in troops the financial cost has rocketed.
Nobel prize winning economist Joseph Stiglitz and co-author Linda Bilmes have compiled the latest figures.