Cost of living in Ithaca, New York (United States) is 97% more expensive than in Łódź (Poland)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 354 prices entered by 33 different people.
For example, you would need at least 15,003 zł ($4,115) in Ithaca, New York to maintain the same standard of living that you can have with 7,600 zł in Łódź.