IQ Score Meaning
Enter an IQ score to see a complete breakdown: classification on the Wechsler and Stanford-Binet scales, career implications, what it means for everyday life, and how it compares to the rest of the population.
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Scores are interpreted using the Wechsler scale (mean = 100, SD = 15) and Stanford-Binet scale (mean = 100, SD = 16).
Wechsler IQ Classification Scale
| IQ Range | Classification |
|---|---|
| Below 70 | Extremely Low |
| 70–79 | Borderline |
| 80–89 | Low Average |
| 90–109 | Average |
| 110–119 | High Average |
| 120–129 | Superior |
| 130–144 | Very Superior |
| 145+ | Genius / Near-Genius |
Stanford-Binet IQ Classification Scale
The Stanford-Binet scale uses a standard deviation of 16 (vs. 15 for Wechsler), resulting in slightly different classification boundaries. Learn more about the differences between WAIS and Stanford-Binet.
| IQ Range | Classification |
|---|---|
| Below 68 | Intellectually Deficient |
| 68–78 | Slow Learner |
| 79–88 | Below Average |
| 89–110 | Average |
| 111–119 | Above Average |
| 120–131 | Superior |
| 132+ | Very Superior / Gifted |
Understanding IQ Score Ranges
IQ scores are designed to follow a normal (bell curve) distribution, with most people clustering around the average of 100. The standard Wechsler classification divides scores into categories from "Extremely Low" (below 70) to "Very Superior" (130+), each representing a distinct level of cognitive functioning.
These classifications are not arbitrary labels. They reflect meaningful differences in how people process information, solve problems, and learn new skills. A score of 115, for example, means faster-than-average learning speed and better abstract reasoning, while a score of 85 might mean needing more time and concrete examples to absorb new material.
How IQ Relates to Career Success
Research consistently shows that IQ is one of the strongest predictors of job performance, particularly for complex occupations. Higher IQ scores are associated with faster training, fewer errors, and greater adaptability in demanding roles.
However, IQ is not destiny. Grit, persistence, and entrepreneurial drive play significant roles alongside cognitive ability. People with moderate IQ scores who are highly motivated and well-trained often outperform higher-IQ peers who lack direction or discipline. Understanding your score helps you find roles where your cognitive profile is a natural fit. This is where cognitive job fit becomes critical. To see how your score compares to specific careers, explore our IQ by Profession tool.
The Role of Standard Deviation
The standard deviation is the key to understanding how IQ scores are distributed. On the Wechsler scale (SD = 15), about 68% of people score between 85 and 115, about 95% score between 70 and 130, and about 99.7% score between 55 and 145. Scores outside these ranges become exponentially rarer.
Can You Improve Your IQ Score?
The scientific consensus is nuanced. Fluid intelligence (the ability to reason through novel problems) is largely stable, but certain factors can influence IQ scores: education, nutrition, cognitive training, sleep, and reducing environmental stressors. While dramatic gains are unlikely, modest improvements are possible, especially in childhood and adolescence.
IQ and Income: What the Data Shows
Studies show a meaningful correlation between IQ and lifetime earnings, though the relationship is far from deterministic. On average, each additional IQ point above the mean is associated with higher income, but education, social capital, and career choices are powerful mediating factors. For a deeper look, see our analysis of the IQ-income correlation.
Frequently Asked Questions
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