Since 2002, the World Happiness Report has used statistical analysis to determine the world’s happiest countries. In its 2021 update, the report concluded that Finland is the happiest country in the world. To determine the world’s happiest country, researchers analyzed comprehensive Gallup polling data from 149 countries for the past three years, specifically monitoring performance in six particular categories: gross domestic product per capita, social support, healthy life expectancy, freedom to make your own life choices, generosity of the general population, and perceptions of internal and external corruption levels.

https://worldpopulationreview.com/country-rankings/happiest-countries-in-the-world