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adults normal IQ level

What is a good IQ range?

Intelligence Quotient IQ is calculated as IQ=(mental
age/chronological age)*100. This means that the average
population IQ should be 100 (1/1*100).

Some interesting good IQ range guide:

  • IQ ranges from 0 to 200 for adults
  • IQ ranges from 0 to 250 for children
  • 80% of the population has a normal IQ range between 80 to 120. 
  • 50% of the population has an IQ range between 90-110
  • 10% of the population has an IQ below 80
  • 10% of the population has an IQ above 120
  • People with Low IQ below 75 (around 5% of the population) are hard to train usually.

Meaning of IQ tests

IQ levels can help identify certain criteria for the future of a person. Please use the table below with a pinch of salt. It is used only as a guide and has no definitive conclusion. If you take an IQ test on a bad day, you might get a biased and untrue result of 
your real IQ.

  • IQ level Probable Job % of population
  • Below 80 Trash pickup service, lawn mowing 10%
  • 80-90 Fast food 10%
  • 90-110 receptionists, typists, clerks 50%
  • 110-120 (good IQ range) teachers 20%
  • above 120 Doctors, professors, lawyers, dentists 10%

High IQ might be good for very complicated jobs. However, normal people would require a normal IQ range around the 100 mark.

IQ levels

An IQ level of 130 for a 10 years old child means that his mental age is 13 ((13/10)*100=130). Thus the modern version of the IQ is a mathematical transformation of the rank , which is the primary result of an IQ test.

History of IQ

The first IQ test is attributed to the French psychologist Alfred Binet in the year 1905 who published the first modern intelligence test. The first IQ test was designed to identify children who needed special help in coping with their school.

A refinement of the first IQ tests was published in 1916 from Stanford University by Lewis M. Terman. David Wechsler published the first IQ test which was explicitly designed for an adult population in 1936. The scale was names the Wechsler Adult 
Intelligence Scale, or WAIS. Since the publication of the WAIS, the Wechsler Intelligence Scale for Children was further refined and coined WISC, which is still in common usage.

Wechsler’s scales separated the verbal and performance IQ scales. This made it less dependent on overall verbal ability than early versions of the Stanford scale.

IQ myths and facts

  • Modern studies using MRI imaging have shown that brain size correlates with IQ.

  • Many studies have converged on the view that the brain frontal lobes are critical for fluid intelligence.

  • Studies have shown that there is a relationship between a person’s IQ scores and the structure of the cortex.

  • Men and women have the same average IQ, in general. However, there are more men with high and low IQ levels than women.

  • Good IQ range and its relation to race has been controversial.

  • Breastfeeding has little to do with the person’s IQ levels.

  • Mental age which is the divisor of the IQ equation stops at 16.

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