How much money did world war 1 cost per day?

World War I is estimated to have cost around $337 billion in total, which translates to approximately $52 billion in 1914 dollars. When broken down, this equates to about $4.5 million per day over the course of the war, which lasted from 1914 to 1918. Adjusting for inflation, the daily cost would be significantly higher in today's dollars. The massive financial burden contributed to economic challenges in many of the involved nations post-war.