Cost of living in Portsmouth (United Kingdom) is 40% 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 506 prices entered by 38 different people.
For example, you would need at least €4,215 (£3,703) in Portsmouth to maintain the same standard of living that you can have with €3,000 in Zaragoza.