War Costs NPR's David Molpus reports on estimates for how much the war against terrorism is costing the United States. The Pentagon isn't saying, but defense experts estimate the armed services are spending more than $2 billion a month on the war in Afghanistan. That doesn't include damage to the economy. An estimated $10 billion is the cost for property damage, cleanup, and rebuilding from the September 11 attacks. That's just a fraction of the damage done to the overall economy in lost production and revenue and doesn't include the added costs of security.