Cost of living in Denver, Colorado (United States) is 165% more expensive than in Łódź (Poland)
This comparison has some inconsistent or sparse data. It already provides a reliable comparison but it is not bullet-proof. It is based on 2,561 prices entered by 418 different people.
For example, you would need at least 17,779 zł ($4,784) in Denver, Colorado to maintain the same standard of living that you can have with 6,700 zł in Łódź.