The answer that comes to mind is the following: How much does your pocket hold!. But you can optimize expenses and enjoy a minimum of comfort, and that leads you to a minimum budget. Kyle and Brianna from RollGlobal.org are two tourists who walked around the world in 2011. They did not circumnavigate the Earth, but they traveled to several countries in Europe (they also went through Romania), Africa and Asia.
In the end they drew the line and it turned out that they spent, by rounding, $ 15 per person. Is it a lot, is it a little? Of this total, $ 000 meant only airfare, and $ 3000 was spent on accommodation and food. Below you have the summary chart provided by the two protagonists!
Avoid Belgium and Africa, and more focus on ASIA! If you are willing, now you have an overview of the amount you need. Courage and pleasant trip, just let us know! :)
Euro or $?
Dollars! My fault .. usual with this European currency, out of instinct! :)