Borderline IQ: 70 to 79

An IQ of 70 to 79 is called borderline intellectual functioning. About 6.8% of people score in this range, roughly 1 in 15. It is below average but above the range linked to intellectual disability, and it is not a diagnosis.

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2.3rd to 9.1st
Percentile
1 in 15
6.8% of people
Borderline
WAIS-IV label
70100130averageIQ 70 to 79
Borderline: 6.8% of people

What an IQ of 70 to 79 means

The range sits between about 1.4 and 2 standard deviations below the mean. The WAIS-IV calls it borderline; the WISC-V and WAIS-5 call it very low.

Most people in this range manage daily life independently. Subjects that rely on abstract reasoning can be harder, and new or fast-changing situations may take longer to work through.

Common characteristics

  1. Learns best by doing

    Hands-on practice and worked examples usually work better than written instructions or theory.

  2. Needs more time with abstract material

    Algebra, dense reading and multi-step reasoning take longer, and repetition helps.

  3. Benefits from structure

    Clear routines, checklists and step-by-step guidance make complex tasks manageable.

  4. Practical strengths

    Many people in this range are reliable, skilled workers in hands-on, people-facing or routine roles.

Work and everyday life

Most adults in this range work and live independently. Jobs with clear procedures and practical tasks suit many people.

Vocational training and apprenticeships are often a better route than long academic courses, and support at school makes a real difference.

What the label does not tell you

A single score can be several points off, and online tests are especially unreliable at this level: unfamiliar formats, language, low motivation or anxiety all pull scores down. A qualified psychologist can give a proper picture if it matters for school, work or support.

IQ classifications are statistical bands on a scale with a mean of 100 and a standard deviation of 15. Individual abilities vary a lot within each band, and intelligence is one factor among many in how life turns out.

What the research says

The DSM-5-TR lists borderline intellectual functioning as something that may need clinical attention, not as a disorder. It is linked to more difficulty at school, which targeted support can reduce.

Labels differ between tests. This range is called borderline on the WAIS-IV, very low on the WISC-V and borderline impaired or delayed on the Stanford-Binet 5. The classifications overview compares the systems, and the IQ chart lists each score range with its percentile.

Borderline IQ: common questions

What does an IQ of 70 to 79 mean?

An IQ of 70 to 79 is called borderline intellectual functioning. About 6.8% of people score in this range, roughly 1 in 15. It is below average but above the range linked to intellectual disability, and it is not a diagnosis. Most people in this range manage daily life independently. Subjects that rely on abstract reasoning can be harder, and new or fast-changing situations may take longer to work through.

What jobs suit people with an IQ of 70 to 79?

Jobs with clear procedures and practical, hands-on tasks. Vocational training and apprenticeships are often a better route than long academic courses.

How rare is an IQ of 70 to 79?

About 6.8% of people score 70 to 79, or roughly 1 in 15. In a room of 100 random people you would expect about 7 in this range.

What are the characteristics of Borderline intelligence?

Common markers include: learns best by doing, needs more time with abstract material, benefits from structure, practical strengths. These describe tendencies across groups of people, not rules for any one person.

Can IQ in the 70 to 79 range be improved?

Not by much, for most adults. Scores are fairly stable after childhood. Each extra year of education adds roughly 1 to 5 points on average (Ritchie and Tucker-Drob, 2018), and practising one test raises scores on that test, but no method reliably raises general intelligence by a large amount. Sleep, health, stress and testing conditions all move a single result by a few points.

What are the limitations of an IQ of 70 to 79?

A single score can be several points off, and online tests are especially unreliable at this level: unfamiliar formats, language, low motivation or anxiety all pull scores down. A qualified psychologist can give a proper picture if it matters for school, work or support.

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Sources

  1. Wechsler, D. (2008). Wechsler Adult Intelligence Scale, Fourth Edition (WAIS-IV). Pearson.
  2. American Psychiatric Association (2022). Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR).
  3. Gottfredson, L. S. (1997). Why g matters: The complexity of everyday life. Intelligence, 24(1), 79-132.
  4. Hunter, J. E., & Schmidt, F. L. (1996). Intelligence and job performance: Economic and social implications. Psychology, Public Policy, and Law, 2(3-4), 447-472.
  5. Schmidt, F. L., & Hunter, J. E. (1998). The validity and utility of selection methods in personnel psychology. Psychological Bulletin, 124(2), 262-274.
  6. Lubinski, D. (2009). Cognitive epidemiology: With emphasis on untangling cognitive ability and socioeconomic status. Intelligence, 37(6), 625-633.
  7. Terman, L. M., & Oden, M. H. (1959). The Gifted Group at Mid-Life. Stanford University Press.
  8. Lubinski, D., & Benbow, C. P. (2006). Study of Mathematically Precocious Youth after 35 years. Perspectives on Psychological Science, 1(4), 316-345.
  9. Ritchie, S. J., & Tucker-Drob, E. M. (2018). How much does education improve intelligence? A meta-analysis. Psychological Science, 29(8), 1358-1369.

Percentages use a normal distribution with mean 100 and standard deviation 15. Methodology