1. Logical Reasoning
Explore Test →Evaluates deductive logic, syllogisms, condition evaluation, and cause-and-effect reasoning under structured constraints.
PSYCHOMETRICS & COGNITIVE SCIENCE
What Is an IQ Score?
Everything you need to know about the Intelligence Quotient: how deviation scoring works, what the normal distribution bell curve represents, and how to interpret your cognitive strengths.
Population Median
100
Global normative midpoint
Standard Deviation
±15
Wechsler standard deviation scale
Average Range
85–115
68.2% of global population
Interactive Psychometrics
The Normal Distribution (Bell Curve)
Drag the slider below to see where any IQ score falls on the standardized Gaussian distribution.
IQ 100
Percentile Rank
50th
Higher than 50% of people
Classification
Average
Normal cognitive baseline
Population Rarity
1 in 2
Represents 50% of the population
Psychometric Blueprint
The 5 Cognitive Domains Measured
Modern cognitive science assesses intelligence as a multifaceted profile rather than a single number:
2. Numerical Reasoning
Explore Test →Measures recognition of mathematical progressions, interleaved sequences, proportional relationships, and mental quantitative agility.
3. Spatial Reasoning
Explore Test →Mental 2D/3D rotation, folded paper projections, isometric cube block counting, and geometric perspective transformations.
4. Pattern Recognition
Explore Test →Raven-style progressive matrix solving, shape metamorphosis, and non-verbal logic. The purest empirical measure of fluid intelligence (g-factor).
5. Verbal Reasoning
Explore Test →Conceptual relationships between words, lexical analogies, contextual inference, and semantic classification.
Classification Scale
Standard IQ Score Classification Bands
Standard psychological classification bands based on the Wechsler deviation IQ scale (mean 100, SD 15):
| IQ Range | Classification | Percentile Equivalent | Population Share | Significance |
|---|---|---|---|---|
| 130 and above | Very Superior / Gifted | Top 2% | 2.2% | Mensa Threshold |
| 120 – 129 | Superior | 91st to 97th | 6.7% | High Capacity |
| 110 – 119 | High Average | 75th to 90th | 16.1% | Strong Reasoning |
| 90 – 109 | Average | 25th to 74th | 50.0% | Population Baseline |
| 80 – 89 | Low Average | 9th to 24th | 16.1% | Improves with Practice |
| 70 – 79 | Borderline | 3rd to 8th | 6.7% | Targeted Support Useful |
| Below 70 | Extremely Low | Bottom 2% | 2.2% | Clinical Evaluation Advised |
Frequently Asked Questions
Common Questions About IQ Scores
What is considered a normal or average IQ score?
By psychometric definition, the population average IQ score is 100 with a standard deviation of 15. Approximately 68.2% of the global population scores between 85 and 115, and 95.4% scores between 70 and 130.
Can a person’s IQ score change over time?
While adult IQ remains relatively stable relative to peers, cognitive test performance can fluctuate by 5 to 15 points based on sleep quality, physical stress, neuroplasticity drills, emotional state, and the Flynn Effect.
What is the highest possible IQ score on a standardized test?
Standardized psychological tests like the WAIS-IV ceiling at an IQ of 160 (4 standard deviations above the mean, representing roughly 1 in 30,000 individuals). Scores reported above 160 or 200 online are statistical extrapolations rather than clinically standardized measurements.
Does a high IQ guarantee career or life success?
No. Psychological research indicates that while IQ correlates strongly with rapid abstract learning and academic capacity, real-world success depends equally on emotional intelligence (EQ), grit, curiosity, conscientiousness, and social adaptability.