Cost of living in Oporto (Portugal) is 37% cheaper than in Aarhus (Denmark)
This comparison has some inconsistent or sparse data. It already provides a reliable comparison but it is not bullet-proof. It is based on 792 prices entered by 129 different people.
For example, to keep the same standard of living that would require kr29,000 in Aarhus you would need to make just about kr18,168 (€2,439) in Oporto.