Cost of living in Oslo (Norway) is 185% 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 999 prices entered by 189 different people.
For example, you would need at least 18,518 zł (kr 40,419) in Oslo to maintain the same standard of living that you can have with 6,500 zł in Łódź.