IQ Score Guide
| IQ Range | Description | Approx. % of Population |
|---|---|---|
| Below 70 | Intellectual Disability | <2% |
| 70–84 | Below Average | ~14% |
| 85–114 | Average | ~68% |
| 115–129 | Above Average | ~14% |
| 130–144 | Gifted | ~2% |
| 145–159 | Highly Gifted | <1% |
| 160+ | Exceptionally Gifted | <0.1% |
The IQ scale is based on a normal distribution with an average (mean) of 100 and a standard deviation of 15. This means: about 68% of people fall between 85–115, while scores above or below represent progressively rarer cognitive performance levels.
FAQ
How stable are IQ scores over time?
IQ scores tend to remain stable in adulthood, but can vary in childhood due to developmental and environmental factors.
Are IQ tests influenced by genetics or environment?
Both. IQ is shaped by genetic predispositions and environmental influences like education, nutrition, and life experience.
Can IQ scores change?
Yes, particularly in childhood or due to significant life changes, learning, and brain health. However, large shifts are uncommon in adults.
Is IQ the only measure of intelligence?
No. Intelligence includes emotional, creative, and practical skills not captured by a standard IQ test.