Science has not been able to decipher consciousness. It pretends that consciousness is not important because subjective experiences are not valued in science.
The only way science can make sense of subjective feelings and experiences like happiness is to try measure them quantitatively.
Even measuring intelligence is problematic. How can multiple facets of intelligence be captured mathematically as IQ?
Similarly any formula for HQ- happiness quotient- is irrelevant.
A person is happy if she feels so and says so and not because they have money, status, jobs and so on.
Let people decide for themselves what happiness means to them.