🇺🇸The official website of Riot IQ
My Dashboard
  • Home
  • Test Manual
  • Administer IQ Tests
  • Articles
  • Podcast

Table of Contents

  • When Low IQ Becomes a Disability
  • IQ 70-85: Below Average but Functional
  • What Causes Low IQ?
  • The Practical Implications
  • Is Low IQ Permanent?
  • Avoiding Fatalism
  • Getting Assessed
Dec 3, 2025·Special Population & Related Conditions

What is Considered a Low IQ?

What is considered a low IQ? Below 85 is below average (1 in 6 people), 70–75+ is borderline, and <70 may qualify as intellectual disability with daily-life struggles. Discover where the cutoffs really are and what they mean.

Dr. Russell T. WarneChief Scientist
Share
What is Considered a Low IQ?
IQ scores fall along a normal distribution (often called a “bell curve), with most people clustered near the average and fewer individuals as scores move towards the extremes. But what counts as "low"? The answer depends on context and some subjective judgment because there are no sudden breaks or changes in the curve as it goes from its peak at the average to extreme scores. Rather, the transition is very gradual and smooth.

Most IQ tests use a scale where 100 is average and 15 points represent one standard deviation, which is a measure of how spread out scores are. A common definition of “the average range” is a score within one standard deviation (i.e., 15 points) of 100. In the general population, about 68% of people have a score in the average range of 85 to 115, and about 14% of people have a score below 85. 

But whether a score is “low” also depends on the purpose that the score will be used for. The absolute minimum IQ that a person can have to join the United States military is 80, and people with this intelligence level can be trained to complete important jobs in transport, food service, and other areas. An IQ of 80 or 85 is not considered “low” for these jobs. But the same scores are very low for high-skill jobs, such as in medicine or law.

When Low IQ Becomes a Disability

Although there is no strict cutoff, an IQ below 65 to 75 is generally considered the threshold for intellectual disability (formerly called mental retardation). However, a low IQ score alone isn't sufficient for this diagnosis. Professional guidelines require that the person also show significant limitations in adaptive functioning, or the practical skills needed for daily life.

Adaptive functioning includes:

• Conceptual skills: Language, reading, writing, math, reasoning, memory
• Social skills: Interpersonal relationships, following rules, avoiding victimization
• Practical skills: Personal care, job responsibilities, money management, transportation

Someone with an IQ of 65 who can hold a job, manage their household, and maintain relationships might not qualify for an intellectual disability diagnosis. Conversely, someone with an IQ of 75 who struggles with basic self-care might need support services. The diagnosis requires both cognitive and functional impairment.

IQ 70-85: Below Average but Functional

Scores in the 70-85 range represent below-average intelligence without crossing into disability territory.

People in this range typically:
• Complete high school, though often with difficulty
• Work in jobs requiring less cognitive complexity
• Live independently with varying degrees of success

Take our professional IQ test

Want to know your IQ? Try the first ever professional online IQ test.

Try our IQ test
Author
Dr. Russell T. WarneChief Scientist

Contact

Table of Contents

  • When Low IQ Becomes a Disability
  • IQ 70-85: Below Average but Functional
  • What Causes Low IQ?
  • The Practical Implications
  • Is Low IQ Permanent?
  • Avoiding Fatalism
  • Getting Assessed
Article Categories
All ArticlesUnderstanding IQ ScoresTaking an IQ TestRIOT-Specific InformationGeneral IQ & IntelligenceAdvanced Topics & ResearchIQ Scores & InterpretationMensa & High-IQ SocietiesOnline IQ Tests IQ Test Basics & FundamentalsAverage IQ & DemographicsFamous People & IQHistory & Origins Of IQ TestingAccuracy, Reliability & CriticismSpecial Population & Related ConditionsImproving IQ / PreparationSpecific IQ Tests & FormatsIQ Testing for HR & RecruitmentSkills Assessment
Related Articles
What is Considered a Low IQ?Child GiftednessLow IQ and Intellectual DisabilityIQ and AutismIQ and ADHDIs IQ Genetic?
Take our IQ tests

Basic IQ Test

5 subtests + 5 cognitive abilities

Take the IQ test

Features

  • ~13 Minutes
  • IQ score
  • Cognitive abilities breakdown
  • ±5.6 IQ margin of error

5/15 Subtests

Learn more
Vocabulary
Matrix Reasoning
SToVeS
Visual Reversal
Symbol Search
Most comprehensive

Full IQ Test

15 subtests + all cognitive abilities

Take the IQ test

Features

  • ~52 Minutes
  • IQ score
  • Cognitive abilities breakdown
  • ±3.7 IQ margin of error

15/15 Subtests

Learn more
Vocabulary, Information, Analogies
Matrix Reasoning, Visual Puzzles, Figure Weights
Object Rotation, SToVeS, Spatial Orientation
Computation Span, Exposure Memory, Visual Reversal
Symbol Search, Abstract Matching
Simple Reaction Time, Choice Reaction Time
Compare all tests

Measure your
intelligence online.

Google

Assessments

  • All IQ Tests
  • Basic IQ Test
  • Full IQ Test
  • Custom IQ Test
  • Free IQ Test

Our Socials

  • X
  • YouTube
  • Facebook
  • LinkedIn

Other IQ Tests

  • WAIS-V
  • SB-5
  • Raven's 2
  • RIAS-2
  • CogAT 9
  • WISC-V

Community

  • Join Subreddit
  • Join Discord

Other Pages

  • Test Manual
  • Administer IQ Tests
  • About Us
  • Articles
  • Data
  • FAQ

Research

  • What do polygenic scores really predict?
  • Working speed and ability on the RIOT

Intelligence Journals & Organizations

  • Human Intelligence Research & Education (HIRE) Foundation
  • International Society for Intelligence Research (ISIR)
  • Intelligence & Cognitive Abilities Journal (ICA)
  • Intelligence Journal
  • Mensa Foundation

Contact

  • Email
  • Support

News & Press

  • International Society for Intelligence Research
  • American Thinker
  • Mensa Foundation (1/2)
  • Mensa Northern New Jersey
  • The University of Western Australia
  • Prolific
  • Quillette
  • Brainz

Our Articles

  • Gmatclub (1/2)
  • ApolloTechnical
  • LessWrong
  • Psychreg
  • Study in Switzerland
  • SuccessConsciousness
  • Creative Organizational Design (1/2)
  • ABNewsWire
  • Vanderbilt University

Our Articles

  • The Globe and Mail
  • Barchart
  • Journal
  • Mensa Foundation (2/2)
  • Psychologs
  • Creative Organizational Design (2/2)
  • AZBigMedia
  • Thoughts on Life and Love
  • Anxiety and Depression Association of America

Our Articles

  • Before It's News
  • Siglo XXI
  • TechBullion
  • Medium
  • Gmatclub (2/2)
  • MSN
  • National Review
  • Minding the Campus
  • Launching Next

Our Articles

  • Comparing Cronbach’s Alpha and McDonald’s Omega Reliability
  • Breaking the Intelligence & IQ Taboo
  • What is the Flynn Effect?
  • A Comprehensive History of IQ Tests
  • The 15 Subtests of the RIOT

Our Articles

  • How to Take an IQ Test
  • How to Calculate IQ
  • What is the RIOT IQ Test?
  • The Pro-Human Aspects of Intelligence Research
  • What is an IQ Test? A Beginner's Guide.

Our Articles

  • 5 Best IQ Tests in 2025
  • Cognitive Profiles on the RIOT IQ Test Results
  • 6 Cognitive Abilities of the RIOT
  • Are There Any Professional and Real Online IQ Tests?

Our Articles

  • Resources to Learn About IQ and Intelligence
  • Studying IQ Matters
  • The Search for Albert Einstein's IQ
  • Do Non-g Gains from the Flynn Effect Matter?

Riot IQ © 2026

  • Terms of Service
  • Privacy Policy
  • BAA Agreement
  • Test Administrator Terms
  • Terms of Service
  • •Privacy Policy
  • •BAA Agreement
  • •Test Administrator Terms
• Face higher risks for poverty and involvement with the criminal justice system

About 16% of the population scores in this range. That's roughly 1 in 6 people. These individuals aren't intellectually disabled, but they face real challenges in a world that increasingly demands complex cognitive skills.

The minimum IQ for stable employment and independent functioning is generally estimated to be around 75 to 80. Below this threshold, finding and maintaining work becomes progressively more difficult, though not impossible.

What Causes Low IQ?

Intelligence has both genetic and environmental components. Heritability estimates suggest that about 50-60% of IQ differences in typical environments come from genetic factors, with the remainder from environmental influences.

Environmental factors that can lower IQ include:

• Lead poisoning
• Prenatal exposure to alcohol or drugs
• Severe malnutrition in early childhood
• Brain trauma
• Lack of educational opportunities
• Extremely neglectful environments

Some cases of low IQ result from genetic syndromes (like Down syndrome) or brain injuries. But most people with low IQs don't have an identifiable medical cause—they simply fall on the lower end of the normal distribution of intelligence.

The Practical Implications

What does low IQ mean for daily life? It depends on how low.

IQ 70-84: These individuals generally function independently. They may struggle in academic settings and gravitate toward jobs with less cognitive demand, but they manage their own lives. The challenges are real but often surmountable with appropriate support and realistic goal-setting.

IQ 55-69: People in this range typically need some support. They can often learn basic academic skills (reading at an elementary level, simple math), work in structured environments, and live semi-independently with oversight. Many attend special education programs during school years.

IQ 40-54: Significant support is usually necessary. These individuals can learn basic self-care and communication skills but require supervision for most activities. Independent living is rarely possible.

Below 40: Extensive support is required for all aspects of daily living. These individuals may develop very limited language and self-care abilities.

These are generalizations. Individual outcomes vary based on personality, family support, educational opportunities, and other factors beyond IQ.

Is Low IQ Permanent?

IQ is relatively stable throughout adulthood, but it's not entirely fixed. Schooling raises IQ by roughly 1-2 points per year. Adoption into more cognitively stimulating environments can raise IQ by about 3 points. These gains are modest but real.

However, making dramatic changes is difficult. Someone with an IQ of 75 isn't going to reach 115 through any known intervention. The goal isn't to "fix" low IQ but to help individuals maximize their potential and develop compensatory strategies.

Avoiding Fatalism

Low IQ creates challenges, but it doesn't make a meaningful life impossible. Intelligence is one factor among many that shape outcomes. Work ethic, personality traits like conscientiousness and agreeableness, family support, and cultural values all matter.

That said, dismissing IQ differences as irrelevant is unhelpful. Pretending someone with an IQ of 75 can master algebra (let alone become a neurosurgeon) sets them up for failure and frustration. A realistic understanding of cognitive limitations and strengths helps people make better educational and career choices.

Getting Assessed

If you're concerned about your own cognitive functioning or that of a family member, a professional assessment can provide clarity. For situations involving disability determination, educational placement, or clinical diagnosis, seek evaluation from a licensed psychologist who can conduct a comprehensive assessment beyond just IQ testing.