PPP vs Exchange Rate: Why They Give Different Numbers
TL;DR: The market exchange rate tells you what your money trades for. Purchasing Power Parity (PPP) tells you what it buys. They differ because currency markets react to interest rates and capital flows within seconds, while local prices for rent, food and services barely move in response. For comparing salaries or living standards, use PPP. For money you actually intend to transfer, use the exchange rate.
The same salary, two very different answers
Take a salary of $60,000 in the United States and convert it to Indian rupees two ways, using World Bank data for 2025:
| Method | Rate used | Result |
|---|---|---|
| Market exchange rate | 87.16 INR per USD | ₹5,229,507 |
| Purchasing Power Parity | 19.84 INR per international $ | ₹1,190,335 |
The exchange-rate figure is roughly 4.4 times larger. That does not mean the salary is worth more. It means converting at the market rate ignores the fact that a given amount of rupees buys considerably more in India than the same amount of dollars buys in the United States. The PPP figure is the one that answers what standard of living the salary supports.
What each number actually measures
| Measure | What it measures | What moves it | Use it for |
|---|---|---|---|
| Market exchange rate | What one currency trades for against another on currency markets. | Interest rates, capital flows, trade balances, speculation, central bank policy. | Anything you actually transact: transfers, imports, foreign-currency debt, travel money. |
| PPP conversion factor | How much local currency buys the same basket of goods that one international dollar buys in the United States. | Local price levels for housing, food, transport and services, surveyed every few years. | Comparing salaries, living standards, or what an income is worth in real terms. |
How far apart are they in practice?
Dividing a country PPP conversion factor by its market exchange rate gives a price level ratio. Below 1 means local prices are cheaper than the exchange rate implies, so converted income goes further. Above 1 means the opposite. The United States is the reference point and sits at exactly 1.
| Country | PPP factor | Exchange rate | Price level ratio |
|---|---|---|---|
| India | 19.84 | 87.16 | 0.23 |
| Philippines | 20.53 | 57.51 | 0.36 |
| Brazil | 2.58 | 5.59 | 0.46 |
| Mexico | 11.31 | 19.24 | 0.59 |
| Japan | 103.34 | 149.66 | 0.69 |
| Germany | 0.72 | 0.88 | 0.81 |
| United Kingdom | 0.70 | 0.76 | 0.92 |
| Australia | 1.46 | 1.55 | 0.94 |
| United States | 1.00 | 1.00 | 1.00 |
| Switzerland | 1.07 | 0.83 | 1.28 |
Both figures are World Bank data for each country most recent reported year, refreshed August 28, 2026. PPP conversion factor, private consumption (PA.NUS.PRVT.PP) and official exchange rate (PA.NUS.FCRF). Ratios are computed across 160 countries where both figures exist for the same year. See our methodology.
Across those 160 countries the widest gaps are in Egypt, Arab Rep. (0.16), Nigeria (0.21) and India (0.23), where converting income at the market rate understates its local buying power by roughly a factor of four.
Why the gap exists and persists
The short answer is that most of what you spend money on cannot be traded across borders. A haircut, a bus fare, a month of rent, a restaurant meal and a doctor visit are all produced and consumed locally. Their prices are set by local wages and local competition, not by international markets.
Currency markets only price the tradeable part of an economy, and they respond within seconds to interest-rate decisions, capital flows and sentiment. Non-tradeable prices respond over years, if at all. Because wages in lower-income countries are lower, the non-tradeable services those wages produce are cheaper too, which is why poorer countries almost always show a price level ratio well below 1. Economists call this the Balassa-Samuelson effect.
That is also why the gap does not simply close. It is not a mispricing waiting to correct. It reflects a real and durable difference in what things cost in different places.
Which one should you use?
Use the market exchange rate for money that will actually cross a border: remittances, foreign-currency savings or debt, tuition paid abroad, or a holiday budget.
Use Purchasing Power Parity for anything about living standards: comparing a job offer, deciding whether a relocation package is fair, or negotiating a remote salary with a company in another country. That is exactly what the PPP Salary Calculator does, across 184 countries. For the arithmetic behind it, see the PPP formula.
Frequently asked questions
Why is the PPP rate different from the exchange rate?
They measure different things. The market exchange rate is set by currency trading, which responds to interest rates, capital flows and speculation. The PPP conversion factor is derived from surveyed prices for a comparable basket of goods in each country. Because currency markets react to financial conditions far faster than shop prices change, the two figures drift apart and can stay apart for years. Neither is wrong, they answer different questions.
Which is better for comparing a job offer in another country?
Use Purchasing Power Parity. A salary converted at the market exchange rate tells you what the money is worth if you moved it abroad, not what it buys where you would actually be living and spending it. PPP adjusts for local price levels, so it reflects the standard of living the salary supports. Use the market exchange rate only for money you genuinely intend to transfer across borders.
What does it mean when the PPP rate is lower than the exchange rate?
It means local prices are cheaper than the exchange rate implies, so income converted into that country goes further than a straight currency conversion suggests. Most lower and middle-income countries are in this position. When the ratio is above 1, as in Switzerland, local prices are higher than the exchange rate implies and converted income buys less than expected.
Does PPP predict where exchange rates will move?
Only loosely, and only over long periods. The theory holds that exchange rates should drift toward purchasing power parity over time, and there is some historical support for this across decades. Over months or a few years the gap can widen rather than close, so PPP is not a usable forecasting tool for currency movements and should not be treated as one.