World happiness map shows that Costa Rica is the happiest country in the world with a score of 8.5 followed by Denmark with a score of 8.34 followed by other countries. Happiness index shows the average happiness of people in different countries based on surveys. In the survey used for calculating this, respondents answer subjective questions on various aspects.
The global projection on subjective well-being uses a popular measure known as Satisfaction with Life Scale (SWLS), to calculate the happiness index. This method of calculation was developed by Pavot & Diener in 1993.
World happiness index 2010