Purchasing power parity (PPP) measures how much a local currency can actually buy compared to the US dollar — not just what it trades for on currency markets. The World Bank publishes PPP conversion factors for 176 economies, making it the most comprehensive data source for fair international pricing.
The World Bank International Comparison Program surveys prices of hundreds of goods and services across countries. From this data, they calculate a PPP conversion factor for each economy.
The formula is straightforward: take your base price, divide by the US PPP factor (which is 1.00), then multiply by the target country's PPP factor relative to the exchange rate. The result is a price that represents the same “effort to buy” in each market.
For example, if India's PPP factor suggests that local prices are roughly 22% of US levels, a $9.99 app would be priced around ₹349 — affordable for Indian consumers while still reflecting the value of the product.
PPP factors are shown relative to the US (1.00). A factor of 0.22 means local purchasing power is about 22% of the US level, so the price adjusts accordingly.
| Region | PPP Factor | Adjusted Price |
|---|---|---|
| United States | 1.00 | $9.99 |
| United Kingdom | 0.82 | £7.99 |
| Japan | 0.77 | ¥1,200 |
| Brazil | 0.38 | R$29.90 |
| India | 0.22 | ₹349 |
| Nigeria | 0.14 | ₦2,900 |
| Egypt | 0.16 | EGP 79.99 |
FAQ
The PPP conversion factor, published annually by the World Bank's International Comparison Program (ICP), tells you how many units of a local currency are needed to buy the same basket of goods that one US dollar buys in the United States. It's different from the exchange rate because it reflects real local prices, not currency trading markets.
The World Bank PPP is based on a comprehensive basket of hundreds of goods and services, surveyed across 176 economies. The Big Mac Index uses a single product (a McDonald's Big Mac) as a proxy. PPP is more rigorous and covers more countries, but the Big Mac Index is more intuitive and updated more frequently.
For mobile apps, this risk is minimal. App Store and Google Play purchases are tied to the user's account region, which requires a local payment method. Users cannot easily switch regions to exploit lower prices. This makes PPP pricing much safer for apps than for physical goods.
The World Bank publishes updated PPP conversion factors annually, typically mid-year. The underlying ICP benchmark survey is conducted every few years, with annual extrapolations in between. For most apps, annual repricing based on fresh PPP data is sufficient.