Cost of living in Portsmouth (United Kingdom) is 41% more expensive than in Zaragoza (Spain)
This comparison has some inconsistent or sparse data. It already provides a reliable comparison but it is not bullet-proof. It is based on 369 prices entered by 35 different people.
For example, you would need at least €4,217 (£3,712) in Portsmouth to maintain the same standard of living that you can have with €3,000 in Zaragoza.