Why a single headline number is not enough
People often reduce the cost of living to one figure, but that hides the detail that actually shapes your month. Two cities can have a similar total while feeling completely different to live in: one might have punishing rent but cheap transport and food, while the other spreads the cost more evenly. Breaking the budget into categories shows you where the pressure really sits, which matters because you can adjust some costs, such as how far out you live, far more easily than others.
Rent is almost always the biggest line and the one that varies most between cities, so it deserves the most attention when you compare offers. Food and utilities tend to move together with the general price level, while transport depends a lot on whether a city has good public transit or assumes you will drive. Seeing all of this at once helps you judge whether a higher salary in an expensive city really leaves you better off than a modest salary somewhere cheaper.
Single versus family budgets
Household size changes the picture dramatically. A single person can often manage in a small central flat and spend little on food, while a family needs more space and buys far more groceries, so their costs do not simply double. The family view in this tool scales each category separately to reflect that, with rent and food rising more steeply than transport or bills. If you are moving with dependants, always compare on the family setting rather than assuming your single-person experience will carry over.
Turning the comparison into a salary target
The most practical use of a cost comparison is working out the salary you need to stand still. If your current budget covers your life comfortably, scaling it by the cost difference gives you a realistic target for the new city. Use that figure as a floor when you negotiate, and remember to look at take-home pay rather than gross, because tax and social contributions differ between countries and can change the result as much as rent does.
How to use these estimates responsibly
Treat the numbers as a well-informed starting point rather than a precise budget. They are aggregated estimates in US dollars and cannot capture your exact neighbourhood, lifestyle or the exchange rate on the day you move. Pair this tool with a take-home pay calculation and a currency conversion to build a full picture, and sense-check the result against a recent local source before you make a decision that depends on it.