Gross National Income (GNI) is a measurement that gives a country's total wealth. It uses GDP, along with income earned from overseas sources, to calculate the GNI number. The GNI is usually expressed in U.S. Dollars or Euros. The way it is calculated makes it more useful for financial reporting purposes than traditional numbers like Gross Domestic Product (GDP).Gross National Income (GNI) is a measure of a country's total income earned by its citizens and businesses. GNI is calculated by adding two separate factors: Gross Domestic Product (GDP) and Net Direct Investment (NDI).Gross National Income (GNI) is a classification of national income that includes all cash flows received by a country's residents in the form of compensation for work done, rent, profits and interest payments.