According to the International Poverty Line, people are considered to be in 'extreme poverty' if they live on less than $1.90 per day, or the equivalent amount after converting currencies and adjusting for price differences between countries. This is the definition used by the World Bank and many other international institutions.

About 700 million people in the world live below this low threshold. And about 4.7 billion people (more than half of the global population) live on less than 10 dollars per day. (Note: In this interactive chart you can click on the option "Change country" to plot numbers for any country or world region.)