The exchange rate tells you what your money is worth on paper. The cost converter tells you what it actually buys. Drop in any sum, the tool returns the equivalent in 50 cities adjusted for the local cost basket.
Most travelers and relocators reach for the foreign exchange rate when sizing a budget. That number is wrong for the question they are actually asking. A 1,000 dollar a week budget in Zurich buys 600 dollars worth of life in Lisbon terms. A 1,000 dollar budget in London buys 1,800 dollars worth of life in Bangkok. The exchange rate did not move that much; the cost basket did. The cost converter strips out the foreign exchange noise and answers the question that matters: in the city you are heading to, what does your money actually buy.
The conversion is built on the OECD purchasing power parity series, cross checked against Numbeo and Mercer May 2026, and indexed to the United States dollar. The output tells you the local equivalent in dollars for the same standard of living. For the salary side of the same question, see the cost of living calculator. For the macro view across all 50 cities, see the cheapest cities ranking.
Pick the source city, the target city, and the amount. The converter returns purchasing power adjusted equivalents.
The converter uses purchasing power parity, not the foreign exchange rate. The output is what the same standard of living costs in the target city, in USD.
In Lisbon, this is what 2,000 dollars in London buys.
Reading the result. The headline is the equivalent number that holds your basket of monthly spending flat between the two cities. The breakdown table shows the same amount across rent, groceries, transport, utilities, and dining out so you can see where the gap lives. Most cross border conversions are not uniform: rent moves the most, transport the least.
For the comparison view across two specific cities (the same numbers laid out as an editorial), the comparison pages cover every supported pair: London vs Lisbon, New York vs Mexico City, Zurich vs Prague. For the macro view, the cheapest cities ranking sorts the full 50.
The same money, the same OECD basket, indexed to a London weekly budget.
Two patterns the table makes visible. First, the cheapest 25 percent of cities (Bangkok, Mumbai, Buenos Aires, Mexico City, Istanbul) buy 2 to 3 times more on the same dollar than the most expensive 25 percent (Zurich, San Francisco, Singapore, New York, Hong Kong). Second, the middle of the table (Lisbon, Berlin, Vienna, Madrid) sits within 20 percent of London on the same basket, despite headline cost numbers that suggest larger gaps. Headline cost is where the marketing happens; the basket is where the truth lives.
The exchange rate is a price, not a value. Use it for transfers (and use Wise for the lowest spread) and use the cost converter for the budget. The two questions are different. If you are running a 5,000 dollar a month relocation budget against a London baseline, the converter tells you that the same standard of life costs 7,200 in Zurich, 3,800 in Lisbon, 1,900 in Bangkok. The exchange rate has nothing to add to that calculation. Run the converter, then size the move.