Purchasing Power Parity (PPP) Exchange Rate Calculator
Calculate the PPP-implied exchange rate between two countries and compare it to the market rate to find over- or undervaluation.
Purchasing Power Parity PPP theory states that exchange rates should adjust so that identical goods cost the same in different countries when prices are expressed in a common currency. If a basket of goods costs USD 100 in the US and EUR 85 in Germany, the PPP exchange rate is 0.85 EUR/USD.
Absolute PPP PPP Rate = Price Level in Foreign Country / Price Level in Home Country If the PPP rate differs from the market rate, the currency is over- or undervalued.
Relative PPP Over time, exchange rates should change in proportion to inflation differentials: %ΔExchange Rate ≈ Inflation (Home) - Inflation (Foreign)
The Big Mac Index The Economist magazine popularized PPP through the Big Mac Index — comparing the price of a McDonald’s Big Mac worldwide as a simple proxy for the general price level. Currencies where the Big Mac is cheaper than in the US are considered undervalued.
Limitations PPP is a long-run concept. Trade barriers, transportation costs, and non-tradeable goods (haircuts, rent) mean market rates can deviate from PPP for extended periods. The IMF and World Bank use PPP-adjusted figures to compare national incomes across countries.