Cost of living in Portsmouth (United Kingdom) is 37% 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 497 prices entered by 30 different people.
For example, you would need at least €2,736 (£2,458) in Portsmouth to maintain the same standard of living that you can have with €2,000 in Zaragoza.