It is sometimes hard to estimate the financial impact moving to a new city will have. Using cost of living indices allows you to compare the financial differences between two cities and get a better idea of what to expect.
The consumer price index is an indicator of the price of consumer goods, which includes groceries, restaurants, utilities and transportation, however this index does not include expenses linked to accomodation. Rent, restaurant and local purchasing power indices can also help can a bet overall view of the cost of living in a new city.
In the following table each index is relative to New York City, which means that all indices for NYC are 100. Therefore for example, if rent in another city has an index of 80, it means that on average rent in that city is 20% less expensive than in New York City.
Source of data: Numbeo