How to calculate GDP using GDP Deflator? To know this process at first we need to know about two types of GDP; those are 1. Nominal GDP: Nominal GDP shows the production of goods and services at the current year. In nominal GDP price or quantity may be increased. This can be best explained by an example below: Year Price of good A Quantity of good A Price of good B Quantity of good B 2001 1 100 2 50 2002 2 150 3 100 2003 3 200 4 150 Here, Nominal GDP of 2001 = (1 X 100) + (2 X 50) = 200 2002 = (2 X 150) + (3 X 100) = 600 ...