Cost of living in Grenoble (France) is 54% 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 323 prices entered by 33 different people.
For example, you would need at least 2,855,082 ₦ (€6,909) in Grenoble to maintain the same standard of living that you can have with 1,850,000 ₦ in Abuja.