Cost of living in Grenoble (France) is 66% more expensive than in Abuja (Nigeria)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 353 prices entered by 32 different people.
For example, you would need at least 2,804,782 ₦ (€6,418) in Grenoble to maintain the same standard of living that you can have with 1,690,000 ₦ in Abuja.