How many people are dwarfs?

Answer 1

A dwarf is defined as a person being of less height than 147cm (4 feet, 10 inches).
The most common causes to dwarfism are Achondroplasia and Growth Hormone Deficiency (GHD) which account for about 70% of all cases of dwarfism. The prevalense of adults with Achondroplasia is approximately 1 in 25.000. The prevalense of adults with GHD is approximately 1 in 100.000.
Source: Wikipedia

Answer 2

It is estimated that less than 1% of the world's population are considered to be dwarfs, defined as those with a medical condition resulting in significantly shorter stature.