Cost of living in Grenoble (France) is 76% 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 243 prices entered by 28 different people.
For example, you would need at least 3,124,302 ₦ (€7,463) in Grenoble to maintain the same standard of living that you can have with 1,780,000 ₦ in Abuja.