The World Bank publishes PPP conversion factors: http://data.worldbank.org/indicator/PA.NUS.PPPC.RF http://data.worldbank.org/indicator/PA.NUS.PPPC.RF "It tells

The World Bank publishes PPP conversion factors: http://data.worldbank.org/indicator/PA.NUS.PPPC.RF http://data.worldbank.org/indicator/PA.NUS.PPPC.RF "It tells how many dollars are needed to buy a dollar's worth of goods in the country as compared to the United States." I prefer this to absolute numbers as the absolute number fluctuates with the exchange rate.