The calculation of the Big Mac PPP-adjusted exchange rate looks at the price of a Big Mac in a given country and divides it by the price of a U.S. Big Mac. Let's say that we are looking at the Big Mac in China. If a Chinese Big Mac is 10.41 renminbi (RMB) and the U.S. price is $2.90, then - according to PPP - the exchange rate should be 3.59 RMB for US$1. However, if the RMB was actually trading in the currency market at 8.27 RMB for US$1, the Big Mac PPP would suggest that the RMB is undervalued.