IQ Score Chart and Distribution What Your IQ Score Means
Find out where you rank and what your Intelligence Quotient (IQ) score says about your cognitive abilities.
IQ represents how your cognitive abilities compare to the general population. This guide explains IQ score distribution, percentile rankings, and what different IQ scores mean.
"IQ is not just a test score. It reflects a person’s ability to reason, solve problems, think abstractly, and learn from experience."
What Is an IQ Score?
IQ (Intelligence Quotient) is a measure of cognitive ability, assessing reasoning, problem-solving, and memory.
Key Facts About IQ:
- Average IQ: 100
- Standard Deviation: 15
- Higher IQ = Faster problem-solving & reasoning abilities
- IQ is relative, not absolute—your score places you on a bell curve compared to others
How Is IQ Measured? (IQ Testing Methods & Accuracy)
IQ is measured using standardized intelligence tests designed to assess multiple cognitive skills.
IQ Test Comparison Table
| Test Name | Average Score | What It Measures |
|---|---|---|
| Wechsler Adult Intelligence Scale (WAIS-IV) | 100 | Verbal, logical reasoning, spatial ability |
| Stanford-Binet Intelligence Scales | 100 | Memory, mathematical reasoning, problem-solving |
| Raven’s Progressive Matrices | 100 | Non-verbal reasoning |
| Cattell Culture Fair IQ Test | 100 | Culture-neutral problem-solving |
IQ Score Chart – Understanding the Bell Curve
IQ scores follow a normal distribution, also known as the bell curve. This means most people score near the average (100), with fewer people at extreme high and low ends.
IQ Score Distribution:
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68% of people score 85-115 (within 1 standard deviation of the mean)
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95% score 70-130 (within 2 standard deviations)
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99.7% score 55-145 (within 3 standard deviations)
IQ Score Ranges and What They Mean
Each IQ range represents different cognitive abilities.
IQ Score Classification Chart
IQ Score Classification Table
| IQ Score | Classification | Population % | Interpretation |
|---|---|---|---|
| 145+ | Genius | 0.1% | Extremely high intellectual ability |
| 130-144 | Very Superior | 2.1% | Highly advanced problem-solving |
| 115-129 | Above Average | 13.6% | High reasoning and analytical skills |
| 100-114 | Average | 34.1% | Typical cognitive ability |
| 85-99 | Below Average | 34.1% | Slightly below typical cognitive function |
| 70-84 | Low Intelligence | 13.6% | May struggle with complex tasks |
| 55-69 | Borderline Impaired | 2.1% | Significant cognitive challenges |
| Below 55 | Intellectual Disability | 0.1% | Requires support for daily tasks |
IQ Percentile Rankings – How Does Your Score Compare?
Your percentile shows how your IQ compares to others.
IQ Percentile Chart
IQ Score Percentile Interpretation
| IQ Score | Percentile | Interpretation |
|---|---|---|
| 145+ | 99.9th | Higher than 99.9% of people |
| 130 | 98th | Higher than 98% of people |
| 120 | 91st | Higher than 91% of people |
| 110 | 75th | Higher than 75% of people |
| 100 | 50th | Exactly average |
| 90 | 25th | Higher than 25% of people |
| 80 | 9th | Higher than 9% of people |
| 70 | 2nd | Higher than 2% of people |
| 55 | 0.1st | Higher than only 0.1% of people |
The Flynn Effect – Why IQ Scores Have Risen Over Time
The Flynn Effect highlights how IQ scores have risen steadily over the last hundred years, largely due to improvements in formal education, widespread access to books and information, and enhanced nutrition that supports brain development.
Advances in healthcare have reduced childhood diseases that once impaired cognitive growth. More complex and stimulating environments, including technology and problem-solving activities, have also challenged thinking skills. However, recent data from countries like Norway and Denmark show that IQ scores plateau or decline, possibly linked to changes in education quality or lifestyle factors.
How Age Affects IQ Scores
IQ stays relatively stable over time but can be affected by education, experience, and health.
IQ & Age Trends:
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Childhood & Adolescence (5-18): IQ can fluctuate as the brain develops.
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Adulthood (18-60): IQ remains fairly stable, with crystallized intelligence increasing.
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Senior Years (60+): Some decline in fluid intelligence, but wisdom and experience compensate.
Frequently Asked Questions
Common Questions About IQ Scores
Most people score between 85-115. Anything above 130 is considered a very high IQ score.
Yes, but major changes are rare. Cognitive training and education can slightly improve certain abilities.
Professional IQ tests are the most reliable. Online tests can provide a general estimate but vary in accuracy.
IQ plays a role in academic success, but hard work, emotional intelligence (EQ), and perseverance are just as important.
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