Cost of living in Ithaca, New York (United States) is 85% 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 242 prices entered by 29 different people.
For example, you would need at least 12,381 zł ($3,694) in Ithaca, New York to maintain the same standard of living that you can have with 6,700 zł in Łódź.